Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b33cc3bebe1d87…

MALICIOUS

PDF

68.4 KB Created: 2020-12-18 20:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dcb2862778a3f82bf378bb5598ba8749 SHA-1: 76a817480df55c39b8187937b1789e78124c4524 SHA-256: e9b33cc3bebe1d879a6d11d6c7bd1b7a558251a15559f2c93c958c0ea649e915
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to a service manual download, serving as a lure to encourage users to click the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=1999+honda+cr125+service+manual+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502698/normal_5fcb55e44ea29.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/retuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5fb9ce093b60f.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/9a855fe.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/pogoxonesowesodof.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/welolokotodasareze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5fa453db3185e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_5fb5ed6618c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5fbbd6afe3479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5fc1a60f31e3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5fccbd23e5727.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/44f8adf6f.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/3d025669-7745-47e8-bb04-a363db75e25a/20826506987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e05d1f-c5db-4072-8c45-cac163092f77/blue_earth_county_jail_bail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8102672-0320-4905-9058-c58774236537/brave_frontier_evolution_guide.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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 5784 bytes
SHA-256: 344111a52629fcc5e34debf224e0380f1834b26715b3723c1f923dd177f7590f
font_01_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10156 bytes
SHA-256: b0f3082d2693e97902a6683eadc8769745dc721ce7a8be86507b47610f03fa3b

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