Malicious PDF — malware analysis report

Static analysis result for SHA-256 8599aaff07feeac8…

MALICIOUS

PDF

63.1 KB Created: 2020-12-16 19:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e74022137f373a456b6ce9c01068ec SHA-1: 69267cd939ca63db3ed213b589d0fb792a02bc7a SHA-256: 8599aaff07feeac8a91b5820c6a83b360f261736b64b3152e5a22d5eedf932a4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafftec.ru/123?utm_term=ouachita+parish+high+school+football
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/7109381.pdf
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5fce5d1fb84b2.pdf
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/ruwedesenezafeneba.pdf
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5fac143dd2b79.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd664f6bb8ad.pdf
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/ca69801d.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/vadopobis.pdf
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fca9f3c3d3fe.pdf
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/60d4c82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijedusovineti/brindisi_map.pdf
    • https://s3.amazonaws.com/ritoma/16473208510.pdf
    • https://uploads.strikinglycdn.com/files/6e271dd2-6759-4d89-9aae-b1dd7607c84c/76745281232.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe00a5fa04221c71e71c69/1606287525892/spousal_impoverishment_income_allocation_worksheet.pdf
    • https://s3.amazonaws.com/gebukil/16212930838.pdf
    • https://s3.amazonaws.com/henghuili-files/animals_name_with_pictures.pdf
    • https://s3.amazonaws.com/viboxikuz/logo_game_level_6_answers.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_off0000b997.bin
a1eb492f9c53951d400140bae5e29636c547de3e98a3c55e54605985f1cd19e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 5444 bytes
font_01_sfnt_off0000cc12.bin
ba32abd9af88f375e0e28dee4085a577408692037bf4ba6ea81aa1fa6f837cba
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 10328 bytes