Malicious PDF — malware analysis report

Static analysis result for SHA-256 1003d2b9de96b1bb…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 09:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50d686c975d9b50b6847210a88671fad SHA-1: 2fb3a12467015e281ccef383af1561190f1d1585 SHA-256: 1003d2b9de96b1bb5bad853bfa2a5bc609deeed5b6f05033d289cbacd27addeb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://mezovuduw.ru/wix?keyword=clay+county+register+of+deeds+nc
    • http://kefets.xyz/zefowikubem61rs.pdf
    • http://specrazreshenie.com/i_love_crosswords_3_level_5_answers1xm7v.pdf
    • http://rexevivejegox.scienceontheweb.net/zerumubejoku.pdf
    • http://sy0n.icu/viber_for_iphone_85bg8u.pdf
    • http://dnepr24.info/thanks_maambrysj.pdf
    • https://static.s123-cdn-static.com/uploads/4403540/normal_60071d85c92a0.pdf
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5fcc1354d8032.pdf
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fec372cd157a.pdf
    • http://moitender.org/funugumawakorombz9k.pdf
    • http://wordsidepost.top/rush_limbaugh_podcast_youtube3bk1h.pdf
    • http://meetchat.space/47642028021byh1v.pdf
    • http://kutatit.getenjoyment.net/13438099288.pdf
    • http://tehnotop.space/80632296577vxxx3.pdf
    • http://goodsfor.life/vataxofus87oc.pdf
    • http://grantmedica.ru/baseball_boy_game_apk55kjz.pdf
    • http://dimax.website/allen_bradley_powerflex_525_manual14qhu.pdf
    • http://fartook.online/mcse_ccna_interview_questions_and_answerssga3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fojakosi.atwebpages.com/4134031317.pdf
    • http://tavamikilav.myartsonline.com/30382584085.pdf
    • http://womidelere.myartsonline.com/76327697812.pdf
    • http://namepafubi.atwebpages.com/htc_1_m8_screen_replacement.pdf
    • http://rexefobixavater.myartsonline.com/21441105144.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea64.bin
297a29b7f83554aaf98049b6e9f71d94594d684f91e426bd8d7849ecdea42812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5196 bytes
font_01_sfnt_off0000fc22.bin
0d545c81a07176be19befde023f7eb803fb73d2e409766c98a4c93107cd65f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11204 bytes
font_02_sfnt_off0001229b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 4324 bytes

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