Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc438200cada9c2d…

MALICIOUS

PDF

68.0 KB Created: 2020-11-23 05:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b84751e2f38708990aa591c85c447c SHA-1: 183511ae1e58550d279ac20d37a1b1d19c34602f SHA-256: cc438200cada9c2dcf8ceef74adb5f78ba150f8fb834cf47896d191a3f50b3a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'trafffi.ru', suggesting a link farm or redirection to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to download or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=casualty+game+level+2+answers
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9a98836add4.pdf
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/94a94b89c87.pdf
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/dekabubozite.pdf
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5f9be8d29196e.pdf
    • https://lesuwigiwojan.weebly.com/uploads/1/3/4/3/134309114/21b18273.pdf
    • https://raboxodibol.weebly.com/uploads/1/3/4/0/134096122/kasuzaluv.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f946d2242879.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixuduwonifa/conductors_and_insulators_worksheet_5th_grade.pdf
    • https://s3.amazonaws.com/jivuxo/burgundy_dress_formal.pdf
    • https://uploads.strikinglycdn.com/files/84de8d57-6a96-4ce7-8e20-3e963e2f8349/dibuwepuwoxoxusepupaluto.pdf
    • https://s3.amazonaws.com/rekibedafowow/legolanobuzev.pdf
    • https://uploads.strikinglycdn.com/files/0cbeee3c-0444-4195-bcfc-d84ecaafe813/86709895823.pdf
    • https://s3.amazonaws.com/pegek/mufejemorusejasil.pdf
    • https://s3.amazonaws.com/bipovoromoj/wawovilugisowobigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7e.bin
f7b6cf03f96fd81b56611670e5855cfaa85d738f25af37a61e337d2ccb782d64
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 5296 bytes
font_01_sfnt_off0000dd88.bin
9f572108585e63ec8389555b0de56d7daeb23c936eaf23c5b25616759e99d1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11208 bytes