Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb46a3ed2449ff3d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 05:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28fe3d9176351faa5440020a001dcaa9 SHA-1: d5015aca30607bef9fac1fb3f424c0cc8e81ea41 SHA-256: eb46a3ed2449ff3d9879380c1d50ba0937fafbefd203a65f628bd4dc5c2daa9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being vilenefex.ru. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the link farm structure suggest this PDF is designed to lure users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=capitulo+3a+realidades+2+answers+page+56
    • https://cdn.sqhk.co/jivazufevi/cbiaThh/e_wallet_account_nigeria.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_60146cf56e42a.pdf
    • https://cdn.sqhk.co/fabozesemi/auXkibD/xizudomezegejamuba.pdf
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fdf0ebddf32f.pdf
    • https://cdn.sqhk.co/gorubabor/m7ghehH/shooting_star_golf_membership_fees.pdf
    • https://cdn.sqhk.co/wolowivem/gekNTha/takimofevoxiw.pdf
    • https://cdn.sqhk.co/mupalewefe/hahf4ur/borilagewur.pdf
    • https://cdn.sqhk.co/desogepupema/ickm3hh/kafunomador.pdf
    • https://cdn-cms.f-static.net/uploads/4501360/normal_600f47c8340c7.pdf
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ff46c79aca5c.pdf
    • https://cdn.sqhk.co/dedenijikal/hjP6XQE/52031220090.pdf
    • https://cdn.sqhk.co/kamupudoro/rjciihc/15703830198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_24a6f055c0904ea3ae178ca021be7ad9.pdf?index=true
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_5903a313fd10435fbb6f2f06febfe733.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85151453-4749-45ad-b91a-fc231a165344/stuart_mcgill_back_mechanic_uk.pdf
    • https://uploads.strikinglycdn.com/files/0cb02b64-2c20-44ae-b0c0-6b5648850964/56913481191.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_514f959669b1462e9b4982978012dff3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a33b47d-8513-44f2-8504-6ae91bb98733/breadman_plus_bread_machine_manual.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_50738eba735c49ce9cab45f34a0ebe6d.pdf?index=true
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_029fe7f51ffe445fa623cd2c81a523b1.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_87eb23623e9d42cdb05661dbcd5ac301.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_e5419ab90b164a0bba531b4d04a3d46f.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_fb59020955fe4ad096f434c2c5fd0a27.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2cbc1d37-c9fb-4e44-87fe-912b6347117f/vuwosiguf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f712.bin
a1f585d240206ba8178c13b5bcb83446d295667e4a43482e9930f479b445848c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 5696 bytes
font_01_sfnt_off00010a93.bin
b85986efe2979c9c26f779314c1b7c5ea72b18b2efe1e81907164c221808f70a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10692 bytes

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