Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a39b47a9c5fbff4…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 01:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ad760bf91265d04e65823f1c9e849e2 SHA-1: 66cc6dc4fcb5ad69421a9d52fec36e1bfd434bac SHA-256: 2a39b47a9c5fbff4e47d2eff4dde12d55bbe3c596bc4e3918386541ed06a5361
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous embedded URLs. One critical heuristic indicates a PDF link to known malicious redirector infrastructure, specifically 'https://crophysi.ru/strik?utm_term=do+you+think+that+entrepreneurs+think+effectually'. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of many links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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=do+you+think+that+entrepreneurs+think+effectually In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5ff402278f2eb.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/b5c34214ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_6030d8c4b8b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_600dc32ea14c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5fed3ee89e734.pdfIn PDF document text
    • http://natlegend.space/brs_physiology_8th_edition_free_downloadg77dy.pdfIn PDF document text
    • http://detonic-de.website/linux_live_usb_ubuntu_isot04ie.pdfIn PDF document text
    • https://mevuponepom.weebly.com/uploads/1/3/4/8/134899748/biromezinarajinos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6033b82f822b2.pdfIn PDF document text
    • http://introdom.ru/bunker_hill_security_camera_manual_6246830ezp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fdc4159491b0.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/free_chinese_checkers_board_gamel5vkj.pdfIn PDF document text
    • http://tomandbxof.site/oracle_sql_database_10g2ka1v.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/9229128.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/b3ec754be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_60254e8cae8f3.pdfIn PDF document text
    • http://espaceabonnes.com/yahoo_email_for_android5srrp.pdfIn PDF document text
    • http://muslims.net/kidovevotasugumelapajalbpov5.pdfIn PDF document text
    • http://bella24.xyz/gogidogenetisokolifenidamvl.pdfIn PDF document text
    • http://ig-support-service.com/fotagubalopodfwsy.pdfIn PDF document text
    • http://dkmz3.club/the_room_furniture_store_ottawat8m8h.pdfIn PDF document text
    • http://lami-lashes.site/cardiopulmonary_bypass_and_anaesthesiawnvof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 5268 bytes
SHA-256: 0853172c6249a1192f12afc1f6ba6bf8404b6da95e732d36c212c80039f9048d
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 10096 bytes
SHA-256: 92e3335bd08c495dae77ca1e0e808afe90dab66c3d78f5a683da7489a2dec558

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