Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c3a5a8230f20db…

MALICIOUS

PDF

116.4 KB Created: 2021-01-21 00:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 872cff15e3446221e64166301e6f31d7 SHA-1: 96aec96adf86b1c3eb3f990a23e7607856d2fab0 SHA-256: f0c3a5a8230f20db0a07fa91bd658fe9f2199632af2b505cda03c032e0009911
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/123?utm_term=heart+no+kuni+no+alice+wonderful+wonder+world PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ffbfa251c2e5.pdfIn PDF document text
    • https://site-1177495.mozfiles.com/files/1177495/karosororekemozodozogav.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/lojuwonuxekifepebebepodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd90429dd8bc.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/mineral_water_delivery_singapore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff42d333b7f1.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/crossword_solver_former_german_kingdom.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/zejajijajivegakojisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_5fbb6e4f09c61.pdfIn PDF document text
    • https://site-1190639.mozfiles.com/files/1190639/77962079340.pdfIn PDF document text
    • https://site-1168143.mozfiles.com/files/1168143/element_td_2_guide_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/android_x86_32_bit_uefi.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/78951032921.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/anonymize_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/79326315669.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/daresasufanuwasadokev.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/mimotemojeleb.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018517.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18517 25796 bytes
SHA-256: de6a940180885e9133f5ac25409f52859ce73e1c607d0297e9d14fe845e3c106
font_00_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 7688 bytes
SHA-256: 1795c3f4c6a263591d4e4dc8a8db442999072dadc690e6f1358eaa494c6a6844
font_01_sfnt_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 4836 bytes
SHA-256: d75ce70e9747d0661c34ca895caceeedb2ffc47c3d758bcdc476e8330d8ef263
font_02_sfnt_off00015f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3B 11352 bytes
SHA-256: cc007e042f7ad1c485771271d1f788816604d99da9e92ecafa99382eb13d7376
font_04_sfnt_off0001b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2AC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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