Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d14a8223b7b394a…

MALICIOUS

PDF

69.9 KB Created: 2021-04-20 04:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 86b785e5978d6c8b474bf5a2e7440a60 SHA-1: 9f6da239ad922e094015fbebc6de19f3b6f950af SHA-256: 6d14a8223b7b394af9c1318b54c60d39e1cec451391055f1d0d26da435f8d781
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://pelibifir.ru/strik?utm_term=domino%2527s+extra+cheese+pizza+price' and the presence of a link farm on domains like 'koxamuru.weebly.com' point towards a phishing or malware distribution campaign.

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://pelibifir.ru/strik?utm_term=domino%2527s+extra+cheese+pizza+price PDF link annotation
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/biwowarapujewugud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_60377d8cb8cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5ff85367bb6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_601fadff1dfb1.pdfIn PDF document text
    • http://wojexefej.iblogger.org/canoscan_9000f_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fd81edad8afc.pdfIn PDF document text
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/71fefa9.pdfIn PDF document text
    • https://sajinekud.weebly.com/uploads/1/3/5/3/135391411/rexupupozikatezosi.pdfIn PDF document text
    • http://davegopodowog.iblogger.org/java_for_testers_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_603c73da24650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_60415af9644ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_601ec70e11d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_605bef0367d2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd62e96-43c9-48fb-b457-3e0ecc481070/zemudegevabitexiwe.pdfIn PDF document text
    • http://lotidasifiteg.epizy.com/gilota.pdfIn PDF document text
    • http://varuxaze.epizy.com/blue_jackets_2016-17_roster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09497e89-9739-41f5-bd63-c593f13c274a/brother_mfc_7340_remove_drum_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab4d258-b1e4-4842-aea7-23279786f9f6/dopip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723443e1-cfcf-4fc6-aa1f-d51c5f31ff87/sub_zero_fridge_repair_near_me.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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 5292 bytes
SHA-256: b0995c39239eae74d46c4b173119e65fbabf6670eb6e2c44fc86faddd333f5c1
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 11500 bytes
SHA-256: 12cd91b352e3fb7f841eac8ab6f8e48e67c3796adc946636e5a24ac5c78a4c73

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