Malicious PDF — malware analysis report

Static analysis result for SHA-256 491083a1af95e019…

MALICIOUS

PDF

242.8 KB Created: 2020-12-25 05:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a075adee8188073367587de7a03f853d SHA-1: ed00a25b33c28836d1cd079544b2e2b0aaeddaf8 SHA-256: 491083a1af95e019adad5d8e77878d75b17429275a03d6e11ffaee3a026f5aef
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URL pointing to 'trafffi.ru', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure itself also shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=transformers+4+decepticons+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8b4913afb49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5fbe19c0b303c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_5fa5b72bc8485.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/ghhg6hf/make_it_up_to_you_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fc34c9d70260.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/82hjg52/95125539958.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/jbhdhgQ/48744239296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_5fbd957372da6.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/SgfVohT/spiderman_vs_venom_omnibus.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/6d0301f1-829c-42ac-a077-85143419c5e8/darenefezelegavivuteduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1e83b4-ebfc-4036-b5c6-188c6af23de0/vitibiluzuwew.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/67329778047.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_off0003747a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3747A 3240 bytes
SHA-256: 39983b068b65d0d8d7ee15eb38057f833d0441878e9d6bd0fbb98c2fbcde82bc
font_01_sfnt_off00038007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38007 5304 bytes
SHA-256: f0741013b1c895177eefc428b8eae4326b718010284e73951ff6cf7ac6d88031
font_02_sfnt_off000391fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x391FE 14076 bytes
SHA-256: d3659f476f1505b37b57cdde9e46a029349bbe55f99000f61df22949b76e0355