Malicious PDF — malware analysis report

Static analysis result for SHA-256 165b7e3dd58fe440…

MALICIOUS

PDF

68.4 KB Created: 2021-01-16 11:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d7684407f76b127418aabbb4d12e09 SHA-1: 10d77c967710b23ac418fd62a59d7b343bac033b SHA-256: 165b7e3dd58fe440127442c3dbd9d62392f6bf1ada92aa4157fb7e8fafb6cc49
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to other PDF documents, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=chapter+10+ap+bio+reading+guide+answers
    • https://cdn.sqhk.co/jifedibodo/jehbojf/d_day_june_6_1944_facts.pdf
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5feb92a0a92e2.pdf
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fb862809ac1f.pdf
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/figekirizuki.pdf
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fac490693082.pdf
    • https://site-1177644.mozfiles.com/files/1177644/vegadubumisixureb.pdf
    • https://site-1174289.mozfiles.com/files/1174289/36219120784.pdf
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5f9830406c1a3.pdf
    • https://cdn.sqhk.co/tupipitijil/N8KQidH/learn_how_to_invest_in_stocks_for_dummies.pdf
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/wexaseranoxo_buzeninekilofok_nejubojego.pdf
    • https://cdn-cms.f-static.net/uploads/4495042/normal_5fbb689a589e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijedusovineti/puwepasazowawonana.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_off0000ca71.bin
f32001b2d0734fa4d049aa34399f6235f2de24b1bd67f11fe6dee1b383267348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 5520 bytes
font_01_sfnt_off0000dd35.bin
60a6645523f3bb656d71849249a57ce7803d409bee22ba5b03c84f6ba734393e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 12328 bytes

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