Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7930f998396b351…

MALICIOUS

PDF

72.7 KB Created: 2021-04-07 20:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d15bade9a8b919f14fafbe1bfaa309ab SHA-1: bbb30915c2a310d353cca56b3f483b4da380b793 SHA-256: f7930f998396b351b4f844d476675a4ae5063d54fa894005fa0933ef6084b5f4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or known malicious redirectors, indicating a link farm or phishing attempt. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+go+giver+leader+audiobook In PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/sigexewenezibibibona.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/zhigh4i/tevoxofatodokaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/jchegjc/sedewomirujeluguxigoduk.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/tkZHigI/85897867493.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/irYhjas/ww2_fighter_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/7jQgjjj/dakigofoxeles.pdfIn PDF document text
    • http://xemuzaxu.22web.org/wrong_turn_english_movie_all_parts.pdfIn PDF document text
    • http://stileidmo.fun/givamepajoravee5zoa.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/g9hcKge/93550957257.pdfIn PDF document text
    • http://forpost-electrica.ru/kegiwalidojekejupgq9qd.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/d0hjtgg/13166330658.pdfIn PDF document text
    • http://digitalcalakk1.xyz/bad_girl_video_songyj5kf.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/Chgjagf/fantasy_football_expert_fpl_draft.pdfIn PDF document text
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/8c54ffeb8a890.pdfIn PDF document text
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/2505825.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/xomudufe/what_are_the_types_of_progress_report.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/tidodesidepexikez.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/where_is_the_witcher_series_in_the_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/2002_ford_expedition_service_engine_soon_light_flashing.pdfIn PDF document text
    • http://zanelilituf.epizy.com/documentary_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/android_9_disable_game_tools.pdfIn PDF document text
    • http://lusavudipanu.epizy.com/visa_application_form_for_japan.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 5120 bytes
SHA-256: 0213670dc1b47d0f5e24e6cfb681abab5358f75b8690e56b34fc5222efa591a3
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 11624 bytes
SHA-256: ed054493e189454f0745607fa15dba75fab97c1b108baf9e284c3e0378332515

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