Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d8ff2225cc845…

MALICIOUS

PDF

67.6 KB Created: 2021-02-04 07:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a3f3e008bc71b8bedb9b6abea53ac7f SHA-1: 5a2d834dbc92d00dd5456e6970d60809d1ebf2b4 SHA-256: 2b6d8ff2225cc845c92f6e48c32df37135aa99b71fd6faa3635b8669cc82b29b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains or subdomains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9564

Heuristics 5

  • 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.
  • 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
  • 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://jacksth.ru/aws?utm_term=former+civil+engineering+building+nuig
    • https://cdn.sqhk.co/sobexofap/SPRrgjB/goat_simulator_free_play_online.pdf
    • http://torchqbfl.fun/libros_de_abraham_valdelomarturnm.pdf
    • http://shoplus.info/jotuvefiposuzobezogqwono.pdf
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/4114257.pdf
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/2548234.pdf
    • http://thehensleys.org/490693857295omds.pdf
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/dumemumizozemof.pdf
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/bomilomasez.pdf
    • https://cdn.sqhk.co/wewuxujudu/irgd3IY/wedding_makeover_salon_apk.pdf
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/lufuwovamerixu.pdf
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/zutaro.pdf
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/1474487.pdf
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/pirelafu.pdf
    • http://vavilonogamet.epizy.com/sample_office_ergonomic_assessment_report.pdf
    • http://miduzusajaveg.rf.gd/shake_yo_body_song.pdf
    • http://xojaxalevigob.epizy.com/fopizemapuf.pdf

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