Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc79e91c42c122e…

MALICIOUS

PDF

75.3 KB Created: 2021-02-12 16:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73ae4507cf05342c1359876669c52ba7 SHA-1: 7fc99422511806281855a47ab775f2f63eb6b24f SHA-256: edc79e91c42c122ea1bfd2101bebaa73b824a42d50d9fee28d7f2d68e6562a38
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=schwinn+420+elliptical+reviews PDF link annotation
    • https://cdn.sqhk.co/zasemewiti/ihVhiao/zombie_frontier_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/fjajdLA/60538263416.pdfIn PDF document text
    • http://infokurs.design/677300615945dky8.pdfIn PDF document text
    • http://bhd-management.space/kabad375bo.pdfIn PDF document text
    • http://complerbnp.com/abeo_pure_performance_sockscgmx3.pdfIn PDF document text
    • http://milanomoda-italy.site/retroarch_delete_cores_androida9ls9.pdfIn PDF document text
    • http://umdtheatre.ru/tezufisodv9juo.pdfIn PDF document text
    • http://prognoz-football.club/chronicle_herald_crossword_puzzle_answers53jmk.pdfIn PDF document text
    • http://basvuruizleme.online/yellow_wallpaper_short_storye43km.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafikepuvanotu.epizy.com/blackmart_alpha_apk_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/56028115186.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/email_id_format_validation_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/favoposereluwilemaxag.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/uidai_in_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/toyota_camry_hybrid_2012_owners_manual.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 5640 bytes
SHA-256: ccab58821fe559b86679ac362b69a6d247777ff6506b75785ca88fcaf202463e
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10480 bytes
SHA-256: a3379058462c80a254c0791372f14e35deefeaa8ffb37b93e8be12ac70abe571

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