Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdcc9623ef420c0…

MALICIOUS

PDF

92.9 KB Created: 2021-01-22 23:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86b8fbbb602324b467efb85ae8f479e SHA-1: eea63384433f5d09ded487af6c60516aa5d4b2df SHA-256: 6cdcc9623ef420c0206ad8bdc31ff7a2aa1a9469c90e38d8e8c80252b560384a
126 Risk Score

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, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to direct users off-site, likely for phishing or malware delivery.

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/aws?utm_term=enchanting+leveling+guide+skyrim
    • https://cdn.sqhk.co/biluvetizom/iiGjahi/15796974840.pdf
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fd808dd384c2.pdf
    • https://cdn-cms.f-static.net/uploads/4458404/normal_600a4b641028a.pdf
    • http://juzibekemuvur.iblogger.org/car_bumper._io_roof_battle_mod_apk.pdf
    • http://lidedapomegila.iblogger.org/blank_book_review_template_ks2.pdf
    • http://wevoselaxoto.66ghz.com/dragon_balls_game_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fda83865ab8c.pdf
    • https://static.s123-cdn-static.com/uploads/4468843/normal_5fddd4e5636ba.pdf
    • https://cdn.sqhk.co/kojetovukufo/hghduhh/17890339536.pdf
    • https://cdn.sqhk.co/bulegumu/hshmI3a/febomep.pdf
    • http://nutapobo.iblogger.org/jemigirijimitiren.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timituvupame/audio_from_facebook.pdf
    • http://pavinudoj.epizy.com/42580427426.pdf
    • http://ferurexage.epizy.com/guide_touristique_alpes_de_haute_provence.pdf
    • http://wolumonixor.epizy.com/gujranwala_weather_hourly_report.pdf
    • https://s3.amazonaws.com/nisiwanolom/game_loop_pubg_free.pdf
    • http://rotaduwifomol.rf.gd/gujenoboxorifomaxopawini.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012908.bin
2fa38b88fde8bf133d00c4ed46fe4da451b359cf9bcef1d6cf19fc58b29250ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 5536 bytes
font_01_sfnt_off00013bc5.bin
87682c974e410ed38664057f2e9fc923b6f111243f066649f0960c0fbda9233e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 13020 bytes

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