Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc6b92a79cb023d…

MALICIOUS

PDF

90.7 KB Created: 2021-04-07 19:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d6ba06280c08beffddac954cbe307f6 SHA-1: 7bb318fb5f41e7eb5cbf11c7154a794d5aa64327 SHA-256: cdc6b92a79cb023d658b3287925e30f81c652bd0efd68b4cd8d61f99f0268339
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://maypoin.ru/123?utm_term=definitely+maybe+parents+guide
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/263873a3ea.pdf
    • https://mefutegisudaxat.weebly.com/uploads/1/3/4/3/134350432/fabenumusiwenipunip.pdf
    • https://lajakobu.weebly.com/uploads/1/3/4/5/134599687/d17691c277.pdf
    • https://cdn.sqhk.co/metusoteliza/Rvvia7U/rifomekoz.pdf
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/3888339.pdf
    • https://mopamosaxute.weebly.com/uploads/1/3/5/3/135322262/letixusuxujag-wagedetozu.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/4bb231a206dd42.pdf
    • https://fisezogidegogef.weebly.com/uploads/1/3/2/3/132303301/nefesakusobep.pdf
    • http://dalkomis.website/replacement_cord_for_sunbeam_warming_throwwoov5.pdf
    • http://prostotit.site/simple_valentine_cake_decorating_ideas4d7oz.pdf
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/1409128.pdf
    • https://cdn.sqhk.co/jarixizotib/ghhjjCP/97386124058.pdf
    • http://dvigatel.guru/fate_system_dde5ony.pdf
    • http://taher-tcac.com/sarewidimopemiix3rg.pdf
    • http://domen3.club/rutomuwavilelokesosofuri64s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/liwafo/boraginaceae_family_characteristics.pdf
    • https://s3.amazonaws.com/forupokisip/mojojobexuz.pdf
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_ab6e34845a914781a4ccda964f918cd4.pdf?index=true
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_1868b26ac58345f5b732dd6c4f5ca6be.pdf?index=true
    • https://s3.amazonaws.com/votawawo/capture_screen_android_studio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a43.bin
a0d24e6cbd650d4f9edeedd5db3a020defc3e774c68e1ebc7d27bc345b6c9fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 5372 bytes
font_01_sfnt_off00012c6c.bin
1df0b5db525b3c9b6eead816bed25b991650bcc44196619a51af221fc1c6eb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 10260 bytes
font_02_sfnt_off00014f50.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F50 4324 bytes

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