Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7dc83e977ac1cc…

MALICIOUS

PDF

74.3 KB Created: 2021-01-15 06:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9180cdfa0ab317590cffa9f6b68f9ca7 SHA-1: d38f1687c3eb71beedb786d289b24c798b0d415d SHA-256: 4f7dc83e977ac1cc40e5b735875cc1439a63677e49b1d23df9ca78149d1fa071
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, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to '4k video songs free' and the authoring application 'wkhtmltopdf', suggesting a lure for free content to mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=4k+video+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486034/normal_5fbc7c1ad9ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5fd7262c239e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe3a18f098df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5fa62c15530b4.pdfIn PDF document text
    • https://site-1171534.mozfiles.com/files/1171534/ranavigegaravevajovus.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/41899636791.pdfIn PDF document text
    • https://site-1244830.mozfiles.com/files/1244830/xitagerakuforanin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff3727f882e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497095/normal_5faffaf80b532.pdfIn PDF document text
    • https://site-1207127.mozfiles.com/files/1207127/13100489675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fc649c6185f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f8fb5c12fb45.pdfIn PDF document text
    • https://site-1223236.mozfiles.com/files/1223236/star_wars_battlefront_2_pc_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 4948 bytes
SHA-256: f4c96bae4d807934e1332a63fcd7d8304b47440a64d279ecca2cce22164e1eba
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10844 bytes
SHA-256: fb435ed9683e0b9677de2aaac3063089cc6c2f7e85faefc0c30388e4826f0ab5