Malicious PDF — malware analysis report

Static analysis result for SHA-256 8186ce349a5dfd11…

MALICIOUS

PDF

100.5 KB Created: 2021-06-07 10:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bdb1e2531d83ffbcf0efba4a5e7d553f SHA-1: 53950c76aad0f7bf53b5508390ca70e118340e89 SHA-256: 8186ce349a5dfd11f50e1a36e160071c38e2abf03e7cf200efcb1279f2ed6060
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farm domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious link farm designed to obscure the final destination. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=surah+baqarah+in+english+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fdc6e87a348b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5ff64da580335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_601071c5a5fc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fce22ace2e20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460450/normal_60060ef4bdd8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fc91e861df97.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387706/normal_60afe414af5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421200/normal_60059806aa56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_604909bb4d195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144460629/substitution_and_elimination_practice_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0456ec-4e2d-46ce-b89b-f2dc0ff41aa2/organigrama_empresa_comercializadora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5287200-77b2-41bb-ab73-d7d080671001/32338149605.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144555273/dan_harrington_on_cash_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d991134-d404-4be4-aa2f-3ea71dfe9433/98132649630.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144448758/24099637107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f0f78c-6c62-4a91-90b1-e80516c077ba/daxutikimesalip.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/w/file/fetch/144718698/56057503417.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144490509/how_do_i_permanently_activate_my_windows_8_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2072b555-2691-4a28-b96c-8d29499cf30c/62742405628.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014a13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A13 31756 bytes
SHA-256: 0040823176c601fabf6d41d13dbeb699c32443a81cf5c91bd49fdaa8f3890b7d
font_00_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 5764 bytes
SHA-256: ff1749954f6730c58c3bcd034c1339bbf371d6f282800cb0a8bbd4988a49a4a2
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 10724 bytes
SHA-256: 57657e644b61ff51d8aed9e4a42032086bb3e050f92402bb46450effabcacd5c

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