Malicious PDF — malware analysis report

Static analysis result for SHA-256 0470590085febf28…

MALICIOUS

PDF

79.0 KB Created: 2021-02-28 07:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85142c085d2b5c9d1c26b378dc55137c SHA-1: 9e2a124b0401ee1ebcb8b18bfdb21d817b52d9a7 SHA-256: 0470590085febf28137c1a525026b5dbcfd972a91fefa16b20948244cdd7304e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on low-reputation domains, likely to redirect users to malicious content.

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://vilenefex.ru/strik?utm_term=how+to+write+something+about+yourself+for+a+job PDF link annotation
    • https://lidelituni.weebly.com/uploads/1/3/1/4/131452972/8262359.pdfIn PDF document text
    • http://wiinorama.space/que_es_una_homologacion_de_titulotnvvl.pdfIn PDF document text
    • http://oneshops.space/cuisinart_coffee_maker_burr_grind_and_brew_12-cup_coffeemakerpqdup.pdfIn PDF document text
    • https://xubesizodumuruk.weebly.com/uploads/1/3/4/7/134703494/1110806.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/32c9763efd22.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/ex_de_fabio_supervivientes_instagram8ysai.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/7be2f7a0aa.pdfIn PDF document text
    • https://xafuraworeduvux.weebly.com/uploads/1/3/4/7/134752052/mamidali.pdfIn PDF document text
    • http://avlto.best/18485038950sjdmk.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/reasoning_questions_and_answers_for_bank_exams.pdfIn PDF document text
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/2210187.pdfIn PDF document text
    • http://pewujok.mypressonline.com/al_fajr_watch_user_manual.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/5461677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulebosux.myartsonline.com/wedding_ceremony_pastor_messages.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_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 5552 bytes
SHA-256: fbc9c328074b9d125008bf1c3732df13dce6f37a951eb27b1c696330286a4d64
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10208 bytes
SHA-256: 9e1d7fbed944217c0ca70ea09de76bcf0ca9d99a8c5a291048c81f28b3aeb92c

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