Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a7f2787c8da28e…

MALICIOUS

PDF

67.0 KB Created: 2021-02-15 11:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6eed725a8f3fddc277dbe826a363c14 SHA-1: 87cd8924a97fc0d1dad76f3c5e6ef9dbb55b43f5 SHA-256: 42a7f2787c8da28e3acab3fa9add3ae2e8e35792260925dede367cfcfbf4c8d2
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that lead to a link farm, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/strik?utm_term=how+to+become+medical+malpractice+lawyer
    • http://hookup757.fun/software_agreement_contractb0jr8.pdf
    • https://cdn.sqhk.co/sofizagumup/dihcK5G/the_art_of_war_book_year_written.pdf
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/rijabupu.pdf
    • http://zilofunawoson.iblogger.org/arm_bones_crossword_answer.pdf
    • http://wamepiguvoj.iblogger.org/34395021460.pdf
    • http://watasanu.iblogger.org/difference_between_fitted_sheet_and_flat_sheet.pdf
    • https://cdn.sqhk.co/miropefaneka/ggdjhji/ding_dong_song_will_ferrell.pdf
    • http://jovalevuwalu.22web.org/fidemazerasebefekolesabix.pdf
    • http://xomaweluk.22web.org/calendario_mundial_2018_portugal.pdf
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/d429e1115a2e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://toxabose.epizy.com/rar_password_recovery.pdf
    • http://gotozowixefe.epizy.com/best_answer_how_do_you_handle_stress.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc34.bin
e4f6f8e2a98a8c45d0327badbb073faaf0e2753238c3691e26ec7fea4972593c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 5336 bytes
font_01_sfnt_off0000de52.bin
81ee23837bd8265b5e946930432781f18c6534485d6ffc381cf6b22089c8ba69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 9644 bytes

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