Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc311800e42d3238…

MALICIOUS

PDF

62.0 KB Created: 2021-02-16 20:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89fdb6277dd5b3f149b9e12187e05d08 SHA-1: 6494e70f93f8bb865c16159ed86d407d09bec8a4 SHA-256: cc311800e42d3238fbc69da51fbf0c045f21b5d7a8fb201e92bb1d48b1332f33
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating suspicious link farms and invisible links pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=3+major+plant+phyla PDF link annotation
    • https://cdn.sqhk.co/nuvurero/xgihfjc/flux_flow_free_sci-_fi_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/hAHja4R/jadunifabakukufu.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/jjc9icZ/transaction_cash_app_money_sent_screenshot.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ifgdRWM/4706398474.pdfIn PDF document text
    • http://ig-supportcenter.xyz/introduction_to_interdisciplinary_studies_1st_editionn85hr.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/sajezumulobemag.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jRYWwhh/turbo_racing_3d_game_hack_version.pdfIn PDF document text
    • http://lnstagrambusiness.com/paroles_vive_le_vent_a_imprimer93f7u.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/bUjacgj/30304106742.pdfIn PDF document text
    • http://tortomsk.ru/screen_recorder_pro_apk_iphonende9w.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/hf02hcP/honda_gx_motors.pdfIn PDF document text
    • http://powerhdniy.space/2017_eeo-_1_report_template2pwmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijixetav.epizy.com/bomberman_games_free_full_version.pdfIn PDF document text
    • http://numakuzugurewi.rf.gd/patefosuxuwovatisumosebag.pdfIn PDF document text
    • http://ripapekum.epizy.com/bagorunodugaweno.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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 5128 bytes
SHA-256: 885ab55e904f2d9dc421d0ecde5261edbc0151401a4cd5a5c18ef82aa43ef77d
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 9880 bytes
SHA-256: 750e9a2d5abed8cfbb29722fee4eae3bd71d9f90b4afa4f1a75b1e3fb5f00abc

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