Malicious PDF — malware analysis report

Static analysis result for SHA-256 7717738c57d525e9…

MALICIOUS

PDF

80.6 KB Created: 2021-05-06 07:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aaaf8edc99cace312a96a1bcbc6a7678 SHA-1: 23be61c40a53dbb4360cc38e8b09495d994ef1e9 SHA-256: 7717738c57d525e9e81f711e2aa019b5cc9ad9050865c2e78ef6fa45713370c2
164 Risk Score

Malware Insights

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

The PDF contains a lure related to credit card withdrawals, and the 'SE_INVOICE_LURE' heuristic indicates a potential payment scam. The presence of numerous external links, including one to 'zajinet.ru', suggests a phishing or link-farming attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/strik?utm_term=como+sacar+dinheiro+cartao+de+credito+caixa+elo PDF link annotation
    • https://cdn.sqhk.co/riwutosax/IcidjcR/accredited_homeschooling_programs_in_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_60673e85708a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60143be88d544.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/a4hfWCU/roriterumilemafones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_600d4eafa131e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_606abdc6f3437.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/cs1Wyjh/mopetukelovelisanofamix.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/mAhfiia/vibepizobekasokifog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_603eb3eaac45b.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_6063060ded3f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd3da0049796.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/1414193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fe6db9e25b08.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/lojewajepemetulipun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_6026131dbe6e6.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/e560fb74-44df-4fe7-8c6a-03d39f4677ea/86991587132.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/fda_medical_device_incident_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c33707-45b2-427f-8160-72ca556e447e/6012160625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b117136e-0280-47b5-b965-8aacff4c9832/tasibizexe.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/nuxusasavowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082a7333-bf47-4366-92ac-9ba5e1df7b56/17189496204.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/itunes_12._5_1_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/4896950915.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/fukigi.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 5152 bytes
SHA-256: 8aa25b73052ba2191af8f188bd1408639a14d6b310287124a9bc0045d5939857
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 13432 bytes
SHA-256: 28b8453bb98f6b1158d1dd5bf47c761c92a1bdf40d5312af118baa5ed614cba2

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