Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6364a40f02ad52…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 22:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68350422384546953b9a1c9a0f6d1af9 SHA-1: 7069acbc02749a8cb6890ab4b49a40797b8a84fb SHA-256: af6364a40f02ad52269c6c9d9d845ae481bfdd8a89d78010b5b29c563c765c8b
186 Risk Score

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 0.9991

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=dd-wrt+wireless+bridge+dns+problem PDF link annotation
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/tulep_luwaba.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/2999988.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/1717973.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/alopecia_tratamiento.pdfIn PDF document text
    • http://sy0n.icu/how_many_degrees_in_scottish_riteznxob.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/hash_function_in_cryptography_and_network_security.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/rajuw.pdfIn PDF document text
    • http://prodson.space/13765780034cgdhs.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/rebikugiwumagamiwu.pdfIn PDF document text
    • http://korsabarca.com/vidatuln01n.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/baxadelefofibuz/xesugumoradagiwerokoxol.pdfIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_74512a0d9fb1409ba072500001a10a68.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_9af67e77d1a843028d9dc923fc8c911e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/1500_egyptian_cotton_sheets_queen.pdfIn PDF document text
    • http://pevitonorefiz.epizy.com/gajupavo.pdfIn PDF document text
    • http://wajiletum.epizy.com/85146574535.pdfIn PDF document text
    • http://kibozeriso.epizy.com/aldo_leopold_sand_county_almanac.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/vehicle_blackbox_dvr_manuale_italiano.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_6aebb7bb43ab4fa88a655cebbdf671c8.pdf?index=trueIn PDF document text
    • https://521fb3b2-efb2-4a2d-aafe-c9bfc743aa4d.filesusr.com/ugd/89b1bc_4edf0b8a02e6430b820a98484630b91f.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_cbbeb3e38e364140ad155ef9dce35a1b.pdf?index=trueIn PDF document text
    • http://matimok.epizy.com/soguwetepodikaz.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/what_is_anarchy_in_international_relations.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5120 bytes
SHA-256: 7c9a1349935f160b4912b6fa9943b0735c2c9d68859c162ba68aaf1a337ce6a8
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10360 bytes
SHA-256: 34541059b69492adcfd824fa48b41ab39fefc5b93c1d3df81ac7b2182fb72bd4
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71