Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf30795a5c6e3d1…

MALICIOUS

PDF

63.6 KB Created: 2021-02-08 14:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c872ed5c74e571db81805f0bf94d09e SHA-1: 7101a661656fc26c4186ee8f28a334eaffbbd0ae SHA-256: eaf30795a5c6e3d19affc7d7b4c9587278c939c043391bb2e770920374df9d33
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The embedded URLs likely serve as a distribution mechanism for further malicious content.

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://druttle.ru/wb?keyword=hp%20indigo%20media%20guide PDF link annotation
    • http://mattelipsticks.site/suzegegomidfpj7c.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/qidorNK/yellow_lights_lyrics_hudson.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ggjMysE/zombie_frontier_3_sniper_fps_mod_apk.pdfIn PDF document text
    • http://plafond.xyz/ableton_live_9_manual_book7slu9.pdfIn PDF document text
    • https://xafokakiza.weebly.com/uploads/1/3/2/7/132710638/962d1c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/QKidHha/drumsticks_vs_chicken_wings.pdfIn PDF document text
    • http://smeh-mif.space/90025092819mdrpn.pdfIn PDF document text
    • http://yourcy.com/keliroliniwotaxidjg9fz.pdfIn PDF document text
    • http://beach-fruit.fun/cancer_gastrico_colombiaumwpo.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/jffXIji/1987_conquest_tsi_engine.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/4254601.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/TPUWQPx/guduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/2xN9TQb/boo_monsters_inc_halloween_costume_toddler.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/hbdz9Ix/8149113659.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/fx38jb6/gutemovipogekedivuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugubobo/gJMhiiY/31320394555.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_off0000bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 4932 bytes
SHA-256: 6f6bbf110388306d205c7a4510b6a4495d51a3e4a7d93b8c656e8513645b5dad
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 10548 bytes
SHA-256: d71ba1ab12cdad8d9c42d9e4199e0a38b685212bd90735759cf20ca1d9cca581

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