Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6a7f5a8e65ddd4…

MALICIOUS

PDF

73.7 KB Created: 2021-02-26 06:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 96efcbfff9e3102499759ca85cb9eb4b SHA-1: ea32c634be16079c4dbf377fb7abc0157d7a5920 SHA-256: 4e6a7f5a8e65ddd4acf1ba7fffb5a3e08576f888fe1515ec7a025a29517d8bd4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' and related to HP drivers, suggesting a lure for users seeking technical information. The presence of multiple disposable hosting links further indicates a malicious intent to distribute or host malicious content.

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://jacksth.ru/award?keyword=hp+pavilion+dv6-6173cl+windows+10+drivers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5febe79092778.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/how_to_use_haier_gas_range.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/a4ijge9/tifegefefudifamafoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/chihg7v/mawevodawiwemeseva.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/jfjaxjf/sepus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5ff3533c9fe99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5feb47b15e4e8.pdfIn PDF document text
    • http://pubggaming.online/173389042921ynee.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/tjbheq5/xudez.pdfIn PDF document text
    • http://glossywp.online/vififesodexutaxamezidlu3sl.pdfIn PDF document text
    • http://xevamaz.iblogger.org/attestation_pole_emploi_cesu_remplissable.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/Riir1ib/iceycat25_wife_death.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/DdCifhd/moto_camera_tuner_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexuze/gicihKd/no_crop_full_size_dp_without_crop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://depegiwisa.epizy.com/regudujinaza.pdfIn PDF document text
    • http://jedajokojar.epizy.com/android_jetpack_room_database.pdfIn PDF document text
    • http://kobebosafuraw.rf.gd/esc_guidelines_atrial_fibrillation_2010.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/60965519791.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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 5804 bytes
SHA-256: 8c2706343640078fb526b536bb8ca13e67e64da4a07e4c4d180b2a4437364f28
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 10320 bytes
SHA-256: 0c91562bf017a94634395559c46a8de0638d341ebcd7ed9ec6a110d251254801

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