Malicious PDF — malware analysis report

Static analysis result for SHA-256 24735afef65ec0a5…

MALICIOUS

PDF

79.8 KB Created: 2021-05-06 11:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7bd3a771b05119748ed149392f6c6fe0 SHA-1: 5c9e91186f0d4bb79f659d144512589d1a678653 SHA-256: 24735afef65ec0a5e8f4c29d3b5d4f3b125e6a0fcf0fc510e657e5c0476086c4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detected the file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded links, particularly the one to maypoin.ru, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=free+printable+rental+agreement+california PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462974/normal_6047acb6d9944.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/gcfljgo/walelolepufix.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/gcijAx7/the_king_of_fighters_98_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/HpiguLo/fewaxejozumijugojajejebo.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/iVmhbib/pobirebal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_6005579b6922f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26fc633ee6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_438c146d10824b79849bc6adb9595a5f.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_926dd92935734e95ae717ebd3202ae7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03333a8d-b0f4-4728-aaa1-6af369e177e1/padutefub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8abe45-541e-469a-a2d8-8873c6300bd9/29002877207.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_cfa80748f3ea4a5497617ae0046f9a6f.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_18c82637ecf6445c82e0c5621068adcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ead5fe-1ef6-4ce1-b092-4b77667778bb/56308856113.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_34b91678e31d4c7ab97a0112f9e19d19.pdf?index=trueIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_56d2341c06194e948b7c4130cfbe32a8.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_2aa61e989c0849dbbf63e0bf5494b88d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d56948-b497-419c-8374-aa073e83f62e/niwujepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be3c1de-f7fd-40eb-b150-fc7421bf4bde/grade_11_physics_textbook_free_download.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_33afb7a78ed244a1bfa078a27ba402ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ed7e57-f6d1-460a-9010-c316b36917dc/sititapusifubokexizepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77720370-a7fb-454b-ba34-16f7127dcf3a/5624517290.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 5252 bytes
SHA-256: 4a2e9f5c76f5becca2eb8b9640b87c15c7082bf324f6fe196b560d87ea1cb0c1
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 11164 bytes
SHA-256: 4fde0bfab56c850846ceb07ab79fad0dc384895872e0299caa005bd310e8e38a