Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b16464d1d0bc42…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 01:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b22f226035ac14e962eccecb3a6fad8f SHA-1: bd87ed3ad78cb340c281e95fd19e53caddddb1fe SHA-256: c5b16464d1d0bc426fe4b8501d84f9b944384748e6a7c7ac68cf800dc4921f87
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links pointing to other PDFs hosted on various domains, many of which appear to be disposable or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and extensive link farm suggest it's part of a larger campaign to manipulate search results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=boyle%2527s+law+lab+chemistry+b+answers PDF link annotation
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/47e86d40638c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1ba3fedf01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_602987f9d9e3b.pdfIn PDF document text
    • https://kanolapegagidil.weebly.com/uploads/1/3/4/3/134339460/1cfb561b36ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_604750af64e41.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/winiwasaziv.pdfIn PDF document text
    • http://mxbur.fun/43023589350l2f8g.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/9267821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6036d327d67b1.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/4e88341d007.pdfIn PDF document text
    • http://ita-yog.space/952589474832csft.pdfIn PDF document text
    • http://gmetry.online/41640983832lyp4l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5ff321d520b3a.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://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_3de7942585e04b28bad637cbc784964f.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_501923aa14aa4276917f9c77c8ea6b31.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_9bc949b261754396850af8ec37dd36b9.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_93c749d91b454363a5576625ae9f658e.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_4fe2563a2736473288f1b38a5b539c0a.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_351b62f4194649a29b2dbaf0ebbcb72f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 5244 bytes
SHA-256: 98904aa7f12ac2c481afe01f262153a3431ec00fbf9fd0ffcbaae3078ad48f60
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10824 bytes
SHA-256: eff5a9e77c911c949cd239c1dd8346f2d171e49eba28471e424aaf39387157f1
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230