Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea371be75e206945…

MALICIOUS

PDF

83.7 KB Created: 2021-03-02 22:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8402a2ab6244a56188d33a13c4fdeea SHA-1: 84a3c4e82adb193b2772ed9f1759ba1563f40475 SHA-256: ea371be75e2069457cefc57f17faf5db2b2256a9663e5a6e9cc6c996914f27e9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/wix?keyword=watch+troll+hunter+movie+online+free PDF link annotation
    • https://cdn.sqhk.co/vadavenaw/Wjaidgf/81084052465.pdfIn PDF document text
    • http://sisowim.iblogger.org/sailor_360_topics.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/aidaR3j/3569808910.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hcihNje/chocolate_pudding_recipe_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/igGeKKQ/real_world_physics_problems_trebuchet.pdfIn PDF document text
    • http://xojitufos.66ghz.com/jogewavirodevumiwukisola.pdfIn PDF document text
    • https://zetolame.weebly.com/uploads/1/3/0/7/130775520/f44df3e9ab4cc.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/bhdjigc/pokemon_masters_ex_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/jivuzukop/jVie3jb/gadofopokegonewezotok.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/bjggfOz/batun.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/2XaghyM/14110914109.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/3jejbuR/best_board_games_2020_bgg.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/p7kjahd/stickify_5000_stickers_for_whatsapp_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexovivuvere.myartsonline.com/69128041020.pdfIn PDF document text
    • http://gurevetafajes.epizy.com/guvejovutovuvojelixita.pdfIn PDF document text
    • http://jezanijumoz.epizy.com/laratutinil.pdfIn PDF document text
    • http://zarirebotiz.rf.gd/how_to_lead_guided_reading_groups.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/excel_formulas_with_example_2016_download_free.pdfIn PDF document text
    • http://bitezopunofiwu.rf.gd/proceso_de_investigacion_cualitativo.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_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 5016 bytes
SHA-256: e9df18f8b6d02825694011818e5bfd92bd3e5e424fb929081ddb57dd0f77c85d
font_01_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 10476 bytes
SHA-256: b0175f8539d8f9a12f416afd65610fa799d5088b4ab61f6891551f2a610ff7ca

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