Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d59a536f81e4200…

MALICIOUS

PDF

90.5 KB Created: 2020-12-20 17:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f33aec2e1d12a7fd344ef592dd627c3f SHA-1: 8881cd67020c55968f815a2933b345e465960117 SHA-256: 2d59a536f81e420098e691044d94ebaa3df532b8b15d787fae946f362639db0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with one pointing to 'trafffe.ru'. While no scripts were explicitly extracted, the nature of the PDF and the embedded links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=are+all+fungi+autotrophic+or+heterotrophic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5faa59cc9747d.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/zubapomur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fbbc0ebee7fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5f952f4b8e66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f8cc785939fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fa263df6797f.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://s3.amazonaws.com/wifukedot/cicerone_guide_books.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78031f140fc3aa589f931/t/5fd6653b481cfa31adc821be/1607886140439/format_bulleted_list_indesign.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f3398139af03765f0b98/t/5fce0ac79aa2de0c64ba16e5/1607338697015/83596245471.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd016c30a162e0c4c3cab/t/5fc123a0eaf37e3b64c47fbb/1606493089187/7929027350.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffcc36609fd0ee78c2f31/t/5fc20bfefa04221c7166a9a0/1606552574887/guide_gear_swivel_chair.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/winuvokegetetumasapuze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cdab3398ff75152d912c/t/5fc0f39d9b1ed03538fdbd4a/1606480797936/fiwosodibiporojedobe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50c4ebe9b693951258028/t/5fd73dc489566e781f6a4709/1607941590909/20994821082.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/gegeporu.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/woodland_elementary_school_troy_mi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 4968 bytes
SHA-256: 8757dd71f928de264a767fac67fc00506998b64f8fd08e7a87082ff08c565240
font_01_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 10520 bytes
SHA-256: e6651f60460e6b07e12bc7cb7b91c7835c7a7c9e641a64b190c0b6f74bc3ed2f
font_02_sfnt_off00014eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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