Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae3f3a9ffd79159…

MALICIOUS

PDF

75.7 KB Created: 2021-05-15 13:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6c14018b46f0863cb7458f4bd24530c4 SHA-1: d1cbc8fa5ce624044acc36d5acaf04eaf4f3b0a5 SHA-256: 8ae3f3a9ffd79159a4494b56bf5ebea7903a29561c26884b895376c425996457
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://jacksth.ru/strik?utm_term=kung+fu+panda+2+netflix PDF link annotation
    • http://bevawedogel.22web.org/was_the_bronze_horseman_made_into_a_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60124f06def41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5ff5d5625d41f.pdfIn PDF document text
    • http://liketime.online/tibigofz9fx8.pdfIn PDF document text
    • http://takipleskazan.org/valentines_edible_cake_decorations_michaelspxbs9.pdfIn PDF document text
    • http://jumoralidanog.22web.org/wutexakokufivovum.pdfIn PDF document text
    • http://front-glass.space/boys_brigade_uniformrvmc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_606ea84ae8ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_606bea5beab6b.pdfIn PDF document text
    • http://pitushok.fun/ruger_air_rifle_reviewlsjvk.pdfIn PDF document text
    • http://usecabinets.xyz/medical_surgical_nursing_ignatavicius7ug0n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_d7b1bbead1a44c13b46c3a89fa250f66.pdf?index=trueIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_6da354079b014a3680442a59050a0020.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_72c6d16e65e24b4f8453d80d187b36e6.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_75570ff7dc2447579b3c21d082cebe3f.pdf?index=trueIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_323a45163af741eaa920539419f10264.pdf?index=trueIn PDF document text
    • http://xamipekuxedatif.rf.gd/paper_bag_size_guide.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_6c28675805fc4acebe949ae2a5967f8c.pdf?index=trueIn PDF document text
    • http://memokos.epizy.com/9995869847.pdfIn PDF document text
    • http://fodozuzur.rf.gd/suduzexosakinuzum.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_11807985c54a40769a17b9460d2a67b0.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_db72c7ab3d0f46d480eee40ccdd76ee2.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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5104 bytes
SHA-256: 0f70d14a2ea3e5203db1c90da1c4feda739cad7d8928f969a879a35f9d396c7c
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 12672 bytes
SHA-256: 0c258fee65a1235d7d80a75a6c7f7c9af6850f7b672ebce22665220095557373