Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f23ef205d3578e…

MALICIOUS

PDF

62.6 KB Created: 2021-02-24 09:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 815267a8b31f22465b3cdb9ea206dbd3 SHA-1: acf92e728b92338f20e76b8627300af98d6c4639 SHA-256: a2f23ef205d3578e3cdb0896e4f67d6c290f794de73926b761148f32b08d6f1a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://bologen.ru/strik?utm_term=minn+kota+autopilot+upgrade PDF link annotation
    • http://vinuporabomod.iblogger.org/financial_peace_university_free_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/5fgiiaa/46685554014.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/shd8ghO/vapinugozumopepejabebixev.pdfIn PDF document text
    • https://cdn.sqhk.co/kevuviwa/EuqgeQA/cube_survival_story_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/jbrTRq8/upgrade_assistant_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/h08jdhd/popular_hashtags_for_snapchat_on_instagram.pdfIn PDF document text
    • http://cleaner-inn.club/45794478415tna69.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/fyRijAK/gatibonujamow.pdfIn PDF document text
    • http://wunawuwome.22web.org/birthday_cake_photo_editor_app.pdfIn PDF document text
    • http://servicesforsupport.com/fivipemomirilotew2u5cl.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/cibF0if/red_eared_snapping_turtle_lifespan.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/aNjb0GS/30820902020.pdfIn PDF document text
    • http://kuxidubavez.iblogger.org/koluse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugefojekasarul.epizy.com/free_tri-_fold_brochure_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/difference_between_epigeal_and_hypogeal_germination.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/baffler_standalone_3._1.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/english_to_arabic_translation_software.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 5016 bytes
SHA-256: cf8eff5994179772d9be947ce0db6b372f5d7baabd02ee42226dc601a93c53c6
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 10348 bytes
SHA-256: 17c69d3c8babe9ea9ce2e75d58494cd8db83bf6c8ec13dd26c142fa040a43825

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