Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df3e24212f6ad4a…

MALICIOUS

PDF

106.6 KB Created: 2021-03-24 16:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 27db03a61a199e2ab1ccc70556ab4752 SHA-1: a5eb99aba0aa1f88eed090a00ec63e4e37ff49c0 SHA-256: 4df3e24212f6ad4a9bc61de21ca46666f47aed2e0859a1f2131499385b3803cd
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 pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=vaikom+muhammad+basheer+books+in+malayalam+pdf PDF link annotation
    • http://opt05.ru/caballo_de_troyalibro_verdad_o_mentira58ouz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_6031938f8fa73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409411/normal_5ff5efa52f887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6037d4abce623.pdfIn PDF document text
    • http://efarbok.xyz/99764104704z21r7.pdfIn PDF document text
    • http://realnoe-obshenie.online/14967812522jdbai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fe51358ce952.pdfIn PDF document text
    • http://mkuu.club/zabivelerisusejofiliweluti5wb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_7f5972bdd4e1461fa5b34d2514ec9d30.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_e33d34a68cee4c808cd5012e90107ab3.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_83ad4639d6164b70982515c270da755d.pdf?index=trueIn PDF document text
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_564362761d6d439082052a3cbcd541fe.pdf?index=trueIn PDF document text
    • http://zalogifivisob.rf.gd/30506039413.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_0dee803a47f4409a9b96535834a3142e.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_7fb6cd2e94794eecb2f5599c23f0a0ea.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a2dcb7d943464c67a4c1bbafd0a25472.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_205c8fdebf914358b13c9fe1df629888.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_60c5fd124a6545e9ba55bbd5e52c9d7a.pdf?index=trueIn PDF document text
    • http://disefubukub.rf.gd/south_african_acapella_songs.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 5552 bytes
SHA-256: 6c409bcd64fca8ca712728532ef8f90a0732e83d20abd528058d7db56e1ace6b
font_01_sfnt_off0001431e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431E 16192 bytes
SHA-256: 978fbc912274e3919a081b6dadcc25fa4c33b480f636c7371cac61e147407faf
font_02_sfnt_off000175c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C2 11736 bytes
SHA-256: 990104f543fa13f288d1366ce5a1a1058590272fe5120bc1361eb7de96a1bf31