Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3da2223f3d7f3e…

MALICIOUS

PDF

108.9 KB Created: 2021-05-14 23:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62a4fa19d44203de9d481e79a20501e5 SHA-1: cafbc3b91006f9f513583eee84f72e73ccac6557 SHA-256: ff3da2223f3d7f3edeb6fbf04b5e003b4c61683707341bb0683dcf43476f0be5
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 0.9972

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://dafemum.ru/strik?utm_term=what+nail+shops+are+open+on+sunday+near+me PDF link annotation
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/d4fb6869d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_60475203cbed8.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/fumuzose_mowavumavuja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fcb63e6e9570.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/9bafa7e10fd489a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_604065781eae7.pdfIn PDF document text
    • https://muxorapud.weebly.com/uploads/1/3/4/4/134455491/fad838069f.pdfIn PDF document text
    • http://bluebadgeapproval.com/download_primal_carnage22iic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_602e115f39877.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/9975323.pdfIn PDF document text
    • http://idealica-official-it.website/nelumexagavitotukikofuwarm0q03.pdfIn PDF document text
    • http://generalmassage.online/rofusomaxidajivuzuwuxasujdvz9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_60552da8ba021.pdfIn PDF document text
    • http://ketadiets.site/12335950544zt5pv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_600f9766783cf.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/puporafijozux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_602c6ca5a0f3e.pdfIn PDF document text
    • http://curvepreloved.com/tenifibaruqjmzi.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/3bae56bb13d346.pdfIn PDF document text
    • https://kagepumesafoke.weebly.com/uploads/1/3/4/8/134846889/2233e24fd72.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://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_475d833792ed4023b960bb9a21381a7e.pdf?index=trueIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_dc38b93d687940eaa5df6c08b7ed4b5d.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_c69aa88c9d90429fab28c2e028d65770.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_e65dc6d628f8460398658ee0b076b688.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_728a09a6fc1f4e60b5ce6837c1404a09.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 5196 bytes
SHA-256: 6e875eca182ed5dea37c9422198519ac2889d04d9312962ec35e4719504f8b75
font_01_sfnt_off00015eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAA 4992 bytes
SHA-256: 68b992748b66c2cabf67588399353e69acb6d9f2dbd8a3a73734ab2e69b2f16b
font_02_sfnt_off00016c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9F 12560 bytes
SHA-256: d90fad2cee6edbc7b9443e31284dd011a9f8dc776162d526675ca272ecd2ee39
font_03_sfnt_off0001970d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1970D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34