Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d155cae50be1307…

MALICIOUS

PDF

67.6 KB Created: 2021-03-04 12:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0e1569ca13400ce7735cf0c2ea52e9a SHA-1: 1f7ad0025c58f3d9c35e7ecd35231d55a4c9c215 SHA-256: 0d155cae50be1307c528c86751edc7a4e855f89ba619d01bbf7f0b2885cddffb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or a downloader for a second-stage payload.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=d%2527addario+ej27n+classical+guitar+nylon+strings+normal+tension
    • https://cdn.sqhk.co/wajerewuwer/gdjj77p/download_dino_hunter_king_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601cff0f6eb3f.pdf
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/gimav.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_601326309aa7e.pdf
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6023f65b25b12.pdf
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe52d261ef85.pdf
    • http://gujufifirisin.22web.org/pokemon_explorers_of_sky_evolution_guide.pdf
    • http://fesebenawasoz.iblogger.org/rocket_jump_waltz_sheet_music_trumpet.pdf
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff448562a43a.pdf
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fe647dd462f4.pdf
    • https://cdn.sqhk.co/jawefujivi/hwhdP6B/kagesalufebefizidisozuz.pdf
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/mimekuvinazo.pdf
    • https://cdn.sqhk.co/nolagutotato/Vgejifr/piwamavovumonupupuwox.pdf
    • https://cdn-cms.f-static.net/uploads/4480884/normal_603d93219161f.pdf
    • https://dugorokibo.weebly.com/uploads/1/3/4/6/134651225/zaboboberixiked.pdf
    • http://zisesiso.22web.org/pamavifukavupexilozedug.pdf
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62aa30506f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xetulugesoboko.epizy.com/vevezisinonuxizanubi.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_off0000caad.bin
52c62eaae5fecb32599ac07cbb3e3e6d6f4e352e4b7c69d8ff25b8052fc3cd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 5680 bytes
font_01_sfnt_off0000de16.bin
1f580a99aa6008cb9a4d03581be5d6d5743076333462f44f608651b2aeb17b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 10100 bytes

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