Malicious PDF — malware analysis report

Static analysis result for SHA-256 d616c060ea16c4e5…

MALICIOUS

PDF

135.4 KB Created: 2021-04-24 10:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61210828bb79dd8616842ad34c79cc6a SHA-1: 45d5bf029e0521442bd5a72158ce0f9f1a418a32 SHA-256: d616c060ea16c4e5a895fca6e4ff7843b173630fd3432b92d355770db4f9186f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://architecturaldesigninc.com/sites/default/files/masugikiretige.pdf In PDF document text
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/71048230710.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/wafawujozovu.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/rebunedirewe.pdfIn PDF document text
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/89266631471.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/67198091979.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/pugixenarewowu.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/bofuwidesuxugebogaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=humminbird+fish+finders+for+sale+on+ebayPDF link annotation
    • https://lib.asu.edu/system/files/webform/46247033309.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 17

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_017_off0001ca54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CA54 19380 bytes
SHA-256: fe2a5b1e0db069a79176a433911fc1acc1f90a34d8006d0dff9401b5cf05df50
font_00_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 7916 bytes
SHA-256: b6d8f72b59c47e884b0b6746a25c5cbd96eb494928042fd8f7d2b0ad088f297a
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 6484 bytes
SHA-256: 2e6ebe78b2dd70619ab19f7b84cf66477dc9f4522f4f190c9b7dc53ac86388d1
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 5352 bytes
SHA-256: e0597120e19e5282e9c0b5f672c574ca659f4e2e47e05ed7b5e2da002ba24bfc
font_03_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_04_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 4140 bytes
SHA-256: b7882c459d94d9fb05ee491b72d0ee9c35e8d4bc9ed5787c7a0b3ba78fd6bc86
font_05_sfnt_off0001340f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340F 3048 bytes
SHA-256: e23308bb06bff427f4fe2d795198e016b2e9db23d45fd702446b15ef1a1323d1
font_06_sfnt_off00014015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 4544 bytes
SHA-256: 059070cd149d8977ca78cfd4fb95e986a02e671cdb4f7bc81c5301fc7fc55836
font_07_sfnt_off00014e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1B 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_08_sfnt_off000158d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D4 2604 bytes
SHA-256: d4cda5a9ecb2558448f754249352cd4d73a8f7efff03060ee9a54ebf713292d1
font_09_sfnt_off000163f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F1 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_10_sfnt_off00016d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D90 3840 bytes
SHA-256: 869700f7b438b0b0f23cfbf3a170597ae1a6b01e9ba9f60fe7298d5eefb98f81
font_11_sfnt_off00017ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA8 4336 bytes
SHA-256: 87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284
font_12_sfnt_off00018948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18948 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_13_sfnt_off00019932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19932 17116 bytes
SHA-256: eb0f74ae016ecd49ad724613dd33da8e66727a68967e14df8c819d2d2b2f97a7
font_15_sfnt_off0001ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBC1 3612 bytes
SHA-256: 59ba68889a6ddfc00e7c371aa63d253c82c2fd60b6adad43b7b5c23629b027ac
font_16_sfnt_off0001f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9E1 4216 bytes
SHA-256: a1cdd12e7202d5b84db6fb10a0d71bc51fe40057a00e34d9df4032cbf4e7d52e

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