Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f689e65bcade48…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 16:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb1968b5f70cf9a3884949d0d070166a SHA-1: ef0dafa92d0a00dbaa42f7bb54daa6743b82e6d7 SHA-256: f2f689e65bcade48c0c20e21ef1a674579fff9cb571c5de03b9c28c6a4f32b71
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 or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, contains references to printer reset guides, suggesting a lure to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=how+to+reset+epson+artisan+810+printer
    • http://jovopomutulilo.medianewsonline.com/equilibrium_chemistry_class_11_notes.pdf
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5feffa2aa76af.pdf
    • https://cdn.sqhk.co/vafegijateno/ieaEdcj/gosumoka.pdf
    • http://xatitakuv.iblogger.org/what_are_pimps_like.pdf
    • http://okrasote.info/classroom_management_plan_templatew33co.pdf
    • https://cdn.sqhk.co/dokukavifig/bNd8FpZ/24288687533.pdf
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2aeb522d0d.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_602dea339b25e.pdf
    • http://kizunawinim.getenjoyment.net/wadewamavovadiba.pdf
    • https://cdn.sqhk.co/morureju/yghidhj/12651490649.pdf
    • https://cdn.sqhk.co/batitiviz/70Gjbhj/gyro_boss_apk.pdf
    • http://jepewadagamer.scienceontheweb.net/76036330839.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_602eed46562bd.pdf
    • https://cdn-cms.f-static.net/uploads/4446917/normal_605419ba100a7.pdf
    • http://fruitnaturs.space/rational_and_irrational_numbers_downloadeqdg3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pejigevug.rf.gd/vefebilinokedopetekiji.pdf
    • https://s3.amazonaws.com/pisedij/nodigeges.pdf
    • https://s3.amazonaws.com/pukiza/artistic_english_fonts_free.pdf
    • https://s3.amazonaws.com/besafefaf/duforavuketiv.pdf
    • https://s3.amazonaws.com/xunilukegez/bookworm_adventures_deluxe_android.pdf
    • http://vewawisu.onlinewebshop.net/90968840271.pdf
    • http://tijilidimipep.epizy.com/easy_basketball_plays_for_youth.pdf
    • http://lidusikopi.rf.gd/website_online_zip_free.pdf
    • https://s3.amazonaws.com/gawabog/would_you_rather_questions_for_kids_christmas.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_off0000ee5e.bin
7d4686bd07c4a88511e0dea624757b17b9352085e3c3128acd359bbabdba30b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5224 bytes
font_01_sfnt_off00010040.bin
7e6e79ce243780b75cc598b742d92d0a102c10ff2c4d45ddf4e4d1ea5318fc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 10948 bytes

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