Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace691c800b45cb8…

MALICIOUS

PDF

83.1 KB Created: 2021-05-11 13:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 072e3e788580e984f033fc468000fa5e SHA-1: d102093f67eac054e426834b18e4ceedf0cac541 SHA-256: ace691c800b45cb803cce8f804fc2dc8ba28c18ad5343bf7f6f3e8b234136ba3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=healthy+smoothie+recipes+protein+powder
    • https://static.s123-cdn-static.com/uploads/4382770/normal_6006ea3d05bd8.pdf
    • https://cdn-cms.f-static.net/uploads/4454673/normal_601734ca9dd75.pdf
    • http://zafikapasipugog.medianewsonline.com/business_communication_skills_download.pdf
    • https://cdn-cms.f-static.net/uploads/4413363/normal_602784f19fcd3.pdf
    • https://static.s123-cdn-static.com/uploads/4489838/normal_5ff173879e328.pdf
    • http://mujudesuxiropa.sportsontheweb.net/what_game_controllers_work_with_fire_stick.pdf
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5fee0f87de9e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_21e49abd2e024408bb0df5e006ce221f.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_72186192a05b45dd80c2ce3ffcea4325.pdf?index=true
    • https://s3.amazonaws.com/figidireki/legal_letter_of_advice_template.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_eb9af55657ac475ebd32c857545ef67b.pdf?index=true
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_eabc07fa8c6a453aaa0863f67c11bfb2.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_e6e10013ed364b16aad51155fb7110f7.pdf?index=true
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_347c8401851641278e8cc9eb38792d65.pdf?index=true
    • http://godusisoti.onlinewebshop.net/jimakifesaseko.pdf
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_ce1014e4abd64777aa0bff067ea8742f.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_62c81da168d94ef4809cf9edc8e8d35f.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_80856664f63a49ef862a5308a8ca18ab.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_679872b0717948a7b86c7e0341551f2f.pdf?index=true
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_ab8d52e7bfc1424cb4d94394e94ceca9.pdf?index=true
    • https://s3.amazonaws.com/figidireki/bihar_tet_admit_card_2017.pdf
    • http://wejufutaz.onlinewebshop.net/how_do_i_factory_reset_my_portal.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_off0000f794.bin
f16749dbc14f760acb5a4373f6d995462d620ec4a0b3a5372c6cd4c6dbe35e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 5256 bytes
font_01_sfnt_off00010959.bin
9cf576484624e7af5b4fef2c9efc23f5894d28bac471f18f529060dd5b31b19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 11580 bytes
font_02_sfnt_off00013097.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 4324 bytes

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