Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2823cb6ed94b77…

MALICIOUS

PDF

76.2 KB Created: 2021-03-12 03:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1261e9d8df5f291af4a4ed8da5d435 SHA-1: 2c28b70141317c03256f6bef9b6572cd301e6eb5 SHA-256: ab2823cb6ed94b7770481625792de9bf9d64cbdbbc0d246a45a651bda78c3b97
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://midufefew.ru/award?keyword=maternity+leave+form+pdf+in+tamil
    • http://money-team.site/74749423265e4ejj.pdf
    • http://probnik1313.tech/air_force_1_shadow_pistachiohuqfw.pdf
    • http://biomanua.website/legadoranirhzyl7.pdf
    • http://confirmyourverifiedbadge.com/6478450393813k2i.pdf
    • http://servisvds.ru/litiribaluxukoxejiv41vo8.pdf
    • http://nakidki-alkantara.xyz/stata_programming_reference_manualuh0qd.pdf
    • http://randname.ru/weight_lifting_routine_for_beginners_at_home09pn3.pdf
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/linakora-nubafef-gaxefad-xefulu.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/4337816.pdf
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/pujemowad.pdf
    • http://pristav.pro/kutofisadeta2bqq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_3a96f86ce6994115920d7b3537a40d84.pdf?index=true
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_998dbd1dfe72484e8e802828e92e4b70.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f508a568-c523-49cd-b9a5-d5c9ad26ea81/wugafixibagonomovilil.pdf
    • https://uploads.strikinglycdn.com/files/5da085d0-d25d-4b6b-ae94-2ac27fa1b65b/how_to_become_a_storyteller_in_india.pdf
    • https://uploads.strikinglycdn.com/files/bc5fe3b2-cff6-46eb-84a7-6cbde4033418/5447528530.pdf
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_371041f07a2f47faa80c5d255c2c6d58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/122bb1da-2880-450f-aca9-d1c5650cac34/nenomegevem.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_722e2705459a43619ea6d0183259d76c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/132fe14c-f1bc-422a-b3f6-7c5ab9774dbf/20381516771.pdf
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_2426ff43e6d04d7ba0a8ba1d0df27b3b.pdf?index=true
    • 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_off0000ed3f.bin
81f34044204f17c3b858451b3e6e034458f21520a4faabd629f8e98146b12811		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5176 bytes
font_01_sfnt_off0000fee6.bin
4201beb22139d0812d0a481666088f69ff3948524fc8762f02e48befec98981a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 10768 bytes

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