Malicious PDF — malware analysis report

Static analysis result for SHA-256 c001e831c151dbb7…

MALICIOUS

PDF

70.2 KB Created: 2021-02-19 20:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1cf5f04009ecdad28c92b065fda122bf SHA-1: 96dc1dae7838465830e0b8ab5a4311f84ee695ef SHA-256: c001e831c151dbb7f717f2b9550cc4f07a5a403ee47d667df57845a677fc105f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://maypoin.ru/wix?keyword=the+great+gatsby+pre+reading+webquest+answers PDF link annotation
    • https://cdn.sqhk.co/jezuleku/dJliijg/tasty_3_ingredient_cookies_and_cream_ice_cream.pdfIn PDF document text
    • http://fringigejy.site/waludb3vpx.pdfIn PDF document text
    • http://dalkomis.website/maze_runner_4_trailer_espaolqeckr.pdfIn PDF document text
    • http://resimpub.com/onde_para_conseguir_alma_de_noite_em32lox.pdfIn PDF document text
    • http://help-verification.com/valuation_production_d_crit_ce2wwstd.pdfIn PDF document text
    • http://distornyup.site/18941720074rujbc.pdfIn PDF document text
    • http://stonersfranchise.com/employee_development_plan_template_pptcddwr.pdfIn PDF document text
    • http://cz-nitrof.website/black_widow_trailer_screencaps5uf5k.pdfIn PDF document text
    • http://immortal-sho.club/pafuguqbbvu.pdfIn PDF document text
    • http://myluckybet.xyz/osrs_ironman_dragon_slayer_guidewd8rj.pdfIn PDF document text
    • http://bilkan.fun/suvixusobafodobosimaditzks9.pdfIn PDF document text
    • http://copyrightram.net/elsword_heroic_gear_guideu3npi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebisop/full_hd_movies_bollywood_new.pdfIn PDF document text
    • http://gikuzeviseg.rf.gd/angular_form_set_dirty_false.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/tubojabalefulomutirupuwaz.pdfIn PDF document text
    • http://xoroniwogogo.rf.gd/masevevag.pdfIn PDF document text
    • http://zefupolegemawak.rf.gd/44240357108.pdfIn PDF document text
    • http://javasuk.epizy.com/chile_league_table_stats_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/allahabadhighcourt_aro_answer_key.pdfIn PDF document text
    • https://en.wikipedia.org/wiki/The_Great_Gatsby/media/File:Gatsby_1925_jacket.gifIn 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 5596 bytes
SHA-256: f8769dc944f154cc0624798c5890c310a546c062e30a9c712b79c574f61a5291
font_01_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 10520 bytes
SHA-256: 3c35abd0198b324af014ae487356fe6fb0e66168730a56ac32ac6317eef79a99

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