Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f485564066d9d2f…

MALICIOUS

PDF

72.9 KB Created: 2020-12-21 10:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 25d20ccc193a54ac69f82f75f96b6e12 SHA-1: 7624abc33e7a50d9c7eed351671cd9089130b05b SHA-256: 8f485564066d9d2f4316e87a34b2a2b23f7bc7d3c00c5201ca37a51c900c6902
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as SEO-optimized links, suggesting a link farm or phishing campaign. The primary URL, https://trafffe.ru/strik, is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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=breakfast+near+chatuchak+market PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5f8ddff3ab291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fbd95bebcaf5.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/48afb0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31cd81cb5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f934501770c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5fb9284bd8f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5fa92a6fd0ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f93a3a87ad7f.pdfIn PDF document text
    • https://zurozudosumo.weebly.com/uploads/1/3/4/7/134719863/vusenif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_5fc16ffd27e1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/mergers_and_acquisitions_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/91006637050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b1ff71-3fd3-4287-bc00-246fe886fcf6/ffxiv_white_mage_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0216137b-74a0-45fc-b240-eaefaa6fa052/bernt_bodal_net_worth.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5204 bytes
SHA-256: ca332a50c2a8505a13278245b339c4a845cecf58ec1a76b28900119cdab8ee4c
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 11588 bytes
SHA-256: ac6625d9f8b1ec59d4cea8047895b4dd7d2fead99cbe980da777f1a2086b75d5

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