Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f88e3bca0eac4…

MALICIOUS

PDF

73.1 KB Created: 2021-04-04 13:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60f938548e47ba8cbdc4a9295f249345 SHA-1: 94ce864ccd10e20bbd3499138566a8033812c4d6 SHA-256: b70f88e3bca0eac4291726fd661827c6d22122f8598dc28de438159c74aa2526
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 0.9996

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://seumenha.ru/strik?utm_term=massey+ferguson+mf+35+tractor+parts+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5ff97ea80a57b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_603af7518b916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fe6fdeab6d8a.pdfIn PDF document text
    • http://popukudaweg.22web.org/gta_v_online_hanger_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_60532590a8fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68ae6db768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_602ff65811f66.pdfIn PDF document text
    • http://meetraisins.club/the_secret_law_of_attraction_audiobook_free_download_in_hindir11v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_603c76ad43756.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/100kg_ln_hi_c_bao_nhiu_kg_thtomp96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_600a1ec6a6d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_602b8587b607f.pdfIn PDF document text
    • http://jasovawuke.22web.org/dupudelesonuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_601217c2e854a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_6007feabbe2b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favagapararo.epizy.com/sisakalixazupefo.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_c5c41bcfc38145439beed833e1609238.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_7719fabce436487f955508049492e2ca.pdf?index=trueIn PDF document text
    • http://kitabud.rf.gd/obod_course_review.pdfIn PDF document text
    • http://sepinolet.epizy.com/zesiminuxopunavo.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_58bb93d451284a24b68dc25e9f7b67eb.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_b92e4976d1594590a45423b87d62605d.pdf?index=trueIn 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 5732 bytes
SHA-256: ec1f37a45a69325648c2fa9295c8121a2d236592e4a357387faa7a6378e1b165
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 11644 bytes
SHA-256: dfb06e02176f098ad1345722a7460faf97c6316d043b5a213363bcd643839d93