Malicious PDF — malware analysis report

Static analysis result for SHA-256 376ee2d2b838145e…

MALICIOUS

PDF

76.5 KB Created: 2021-02-28 22:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1a8287782c80ed1e2410055185473866 SHA-1: c456c8d334637bc280413aebd50f0d2d1a0ebf8e SHA-256: 376ee2d2b838145eb1694e3fb30dee9ecb3c8f1be99fddd40da477c547698182
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 domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

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://dafemum.ru/strik?utm_term=types+of+pimps PDF link annotation
    • https://cdn.sqhk.co/lozuzupadis/5hgehbq/end_of_game_buzzer_sound_effect_app.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/lg_inverter_direct_drive_washer_front_load_parts.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/juvedupo.pdfIn PDF document text
    • http://fresh-ita.fun/jofisopvxit.pdfIn PDF document text
    • http://itabody.space/your_endocrine_system_worksheet_answers681t6.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/keurig_k75_coffee_maker_manual.pdfIn PDF document text
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/dewerusegukik.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/iihcjjs/dhoom_4_release_date_2021.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/wuroketo.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/bGijhha/9560958974.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/zevoruzupunexe.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/fvM2gdN/10632351528.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/7jj8vX2/stickman_combat_mod_apk_download.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/duwiwumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/what_is_the_importance_of_potential_and_kinetic_energy_in_our_daily_life.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/ba_english_literature_job_opportunities_in_india.pdfIn PDF document text
    • http://jasesazolaf.myartsonline.com/trainee_educational_psychologist_jobs_london.pdfIn PDF document text
    • http://medexode.atwebpages.com/resonisibox.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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 4760 bytes
SHA-256: aed3cd031da656d21ec39d2425e88dbf1cabedcb786cfc428f86e43f5273ec4c
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10664 bytes
SHA-256: 2cf62cf480eefdd9a97683ae68f1a1535fdfd5641e0229272cd25f4b85ebd1d1

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