Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2a9aa8c31fec04…

MALICIOUS

PDF

87.4 KB Created: 2021-03-05 10:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 261c4c78690fa3c01248ab7d1f39249c SHA-1: 2d25b7e75fa53ae456078ebd6c4a83978b89d7f8 SHA-256: 5e2a9aa8c31fec0419a6543963e916d252da05a18768d59fab993d7a8b6dfe8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wb?keyword=english%20alphabet%20sounds%20chart%20pdf PDF link annotation
    • https://cdn.sqhk.co/melipetoluf/fdifmod/42346857044.pdfIn PDF document text
    • http://rapejavom.22web.org/zebegavewolezuzuwomu.pdfIn PDF document text
    • http://shoppingyxplus.xyz/55577957823m8fbq.pdfIn PDF document text
    • http://damvglaz1.xyz/fujujnvw04.pdfIn PDF document text
    • http://haustova.com/805442594885a22y.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/pgiOVjg/sabepekikatut.pdfIn PDF document text
    • http://sevotapapi.22web.org/zudorofizazusemataboturez.pdfIn PDF document text
    • http://netowamuj.iblogger.org/vans_old_skool_shoes_true_white.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/hfghhhu/66634578350.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/FzGiggf/tonixetonativinofuz.pdfIn PDF document text
    • http://gufutaca3.xyz/fepiwedetimurasujijajonmjxo.pdfIn PDF document text
    • http://politach.com/hex_stars_mod_apkh0d56.pdfIn PDF document text
    • http://hookup157.site/7631645688169cn5.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/rkihhai/linkin_park_wallpaper_for_fan_art.pdfIn PDF document text
    • http://roflan.site/convert_metric_measurements_worksheet3j4md.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/ZGicSjc/3898568839.pdfIn PDF document text
    • http://raketun.22web.org/mental_health_assessment_form_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/ftTggii/red_boy_pitbull_pedigree.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/gfgikp0/sacred_sword_princess_mod_apk_1._10._1.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/dhcsihb/bujofofun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulibifusarumo.rf.gd/74729649919.pdfIn PDF document text
    • http://jufalusa.rf.gd/dozagadojobibodaxokoxi.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/zakakazug.pdfIn PDF document text
    • http://kedokonox.rf.gd/5233028156.pdfIn PDF document text
    • http://devuzobek.rf.gd/35985283121.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_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 5512 bytes
SHA-256: 451e70f3d3e42c723a39f49a5ab210a9d9d8a0a8c0e824528453dc2c9d09f12a
font_01_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 11856 bytes
SHA-256: 8c204bcee30967ac0a3e91b04e3f4073dc6e375e21657a12629774ecbc87b055

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