Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f692c9bc7bf9f6…

MALICIOUS

PDF

100.4 KB Created: 2021-02-22 16:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53f90e642a3b550c29da14cb070a5f4e SHA-1: 214669009ccf33a34695cca1cac56c7c83b6ee61 SHA-256: a8f692c9bc7bf9f62367678db81efac9854193d1856cb50681121fc7b986bc8d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=dizionario+tecnico+meccanico+italiano+inglese+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fc80d563a279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_60292a5ee75a8.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/gusorezawekaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/jgdjhjj/diep_io_tag_game_modes.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/7569045.pdfIn PDF document text
    • http://rmk4sale.xyz/cabinet_vision_training8rqws.pdfIn PDF document text
    • http://repair-monokoles.ru/42581689018af16h.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/8f8b18dcff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_6031f38c5c554.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/f1824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_600126bea0595.pdfIn PDF document text
    • http://verifiedbadges-form.com/justice_league_cartoon_network_episodesvh2yl.pdfIn PDF document text
    • http://trysoda.club/isidora_sekulic_saputnicirlgln.pdfIn PDF document text
    • http://mbfsopg.com/treasury_challan_form_online_haryanabrl6d.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/50c75026a1f5d1.pdfIn PDF document text
    • http://harkateine.fun/76480325904zpi9l.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/07bba6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C98 5524 bytes
SHA-256: 547daf2b12837a01029688a953a3016b81a57608153ed81791a0bcf1bcecce77
font_01_sfnt_off00015f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5E 10620 bytes
SHA-256: 30d7e387777e012ffa63bf4cf2cf9841f6d5d947be42fc6daefe23f1d0b3fdc8

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