Malicious PDF — malware analysis report

Static analysis result for SHA-256 5991e7e39db86ff8…

MALICIOUS

PDF

67.1 KB Created: 2021-02-25 08:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aa7be58dcc667381f4f408c5df288acb SHA-1: 8b1414b7e0413f678e24f4cf4dc5c2c8aecb82f5 SHA-256: 5991e7e39db86ff8ed5cefbd42e6c21759b24ceeef2a47de5277204ec07d8ecc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, including one to 'leonvi.ru', suggesting an attempt to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be related to search engine optimization keywords, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/award?keyword=james+stewart+calculus+solution+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495536/normal_602a3d58bdc3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/jdl2DUU/draw_ten_pin_bowling_christchurch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5ff06d42122b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5fd091ca6fac9.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/64760908101.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/junil.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/5144327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fee6d28ef0b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_602cb8c918774.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/ioDtibP/join_mastermind_group_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375340/normal_6002abaf994bd.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/jicGpjb/15479559369.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/giduvuj_sikuro_gumokavuso_mabus.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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 5228 bytes
SHA-256: c2b2a13814feff9461e1bd5e2a4b7180c36c8183ab6802b670d8d2d73a49f1e8
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 10580 bytes
SHA-256: dad78ac65a30e57bbe6a7053cf3f66f1bf9058ead654d5d5ba7a4c54bdd2c2c8

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