Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f4302359fbf13f…

MALICIOUS

PDF

69.7 KB Created: 2020-12-16 19:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2eda40868d51e7472e9b6944076dc37 SHA-1: 7012c2506c0537672e375088ecccead83aca28ec SHA-256: 51f4302359fbf13fc39decd794f7c90099512fb9813573759255181ef0d8593b
164 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple URLs pointing to PDF files hosted on various platforms. One of the primary URLs, 'https://trafffi.ru/strik?utm_term=relate+multiplication+to+division+lesson+1.8', suggests a potential phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, a common tactic for SEO manipulation or distributing malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=relate+multiplication+to+division+lesson+1.8 PDF link annotation
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/xijebufupuruxux_xobufal_vavibur_rezuraxu.pdfIn PDF document text
    • https://luzonenof.weebly.com/uploads/1/3/4/5/134509067/51da3a6424d992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f87790ea1eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fb38f1bf0ae1.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/3340d226-19b2-4c62-af27-9c852b309e06/chemistry_chapter_1_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/vurumexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10df996-1659-419b-8486-fecd91a23bde/temoxijevodavoje.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/fundamentals_of_plant_virology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88f4f53-7cbf-4837-a49a-c842637db9c2/pumirebetezomeniv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d9f8e2-2729-4e6a-8148-8386bae97111/proform_995_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d0151e-9186-4707-bc50-70b1d3a05911/xutidurafijetufagik.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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 5468 bytes
SHA-256: 772ea5bf2f17917bd3851b5e6de59b0510c5ca064595d4963b7cf3bf5b3977df
font_01_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 11016 bytes
SHA-256: dabc8a18685dc9552b24e5b9279f20403f4f19d2cc6929d183a2fc5d3d64e278

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