Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d61809487c32f8d…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 11:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3486526f1c5c463059ced6a00e51fb94 SHA-1: b4aa00d9f7ce1ffb33ad1a64862c17e03d7cf7ca SHA-256: 5d61809487c32f8d2abd623ec96c8ee2cf49bdc83420e45dad0472db44bd4b62
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=que+es+arquitectura+de+software+pdf PDF link annotation
    • https://cdn.sqhk.co/xuvisisitinu/ihjW2y4/17726351129.pdfIn PDF document text
    • http://storeyou.store/fedigavedotonakusixuxijip2231w.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/z3bhjie/ghana_education_service_syllabus_for_jhs.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/eAejzia/ms_pac_man_tv_game_instructions.pdfIn PDF document text
    • http://changepass.online/charles_law_problems_and_answersigotq.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/1907606.pdfIn PDF document text
    • http://zufabud.22web.org/here_again_elevation_worship_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/oRXGiew/nj_police_officer_jobs_hiring.pdfIn PDF document text
    • http://cg-designer.xyz/zezoracw89y.pdfIn PDF document text
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/8c9aa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/jetukifejawok.pdfIn PDF document text
    • http://jarifixe.epizy.com/psalm_23_4-5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c3754b-9e76-4bed-a5ad-d873155cdc55/best_fishing_hook_knot_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182a774a-ef79-4817-878b-72282e7a307a/from_third_world_to_first_audiobook_free_download.pdfIn PDF document text
    • http://liboditi.rf.gd/what_is_feminist_critical_perspective.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/16245083905.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5396 bytes
SHA-256: c8c7a6e76f242dfe67d732ad073709c0cf9353c5ffc6b63c338ca7534cc6452f
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 12708 bytes
SHA-256: ac0121dd0ee0c8ae003d68627af11d187c42a7ba037a8cb57796c474008133be

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