Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74c2286fc316a0b…

MALICIOUS

PDF

81.8 KB Created: 2021-04-21 10:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976ca7ca4e3d1210ae1a3657cd0b8596 SHA-1: 9cc70f5c35ffefa22657739744f2f80ed9f996ea SHA-256: f74c2286fc316a0bc1c895b273a10cbec651925244d578c22da5163916116a61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external links points to a URL that appears to be part of a malicious campaign. While no scripts were directly extracted, the presence of numerous external links and the ClamAV detection suggest a malicious intent, likely related to phishing or malware distribution.

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=how+to+make+a+homemade+easy+face+mask
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/2845749.pdf
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/a8e6f12a.pdf
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/fisati_jexuvatasanux.pdf
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/f38f284164800.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f4673a81-fd77-4e65-9d06-e1d742655bfb/39497218534.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_7a7c0ba14276412a805f71c09ea9fa11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/201c26ab-8545-4d65-bcb6-35397b9c88ee/85794014749.pdf
    • http://wovibojo.onlinewebshop.net/crossfit_training_programs.pdf
    • https://s3.amazonaws.com/xojafemori/lapuxevafiwixa.pdf
    • https://uploads.strikinglycdn.com/files/1ef5f0ea-286d-4bb6-93c3-5329b2d60f66/how_to_do_a_hundreds_chart_puzzle.pdf
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_64ac9b97a6a34dabbabe39fef6de72b6.pdf?index=true
    • http://buzanuziti.myartsonline.com/how_many_cold_cranking_amps_for_riding_lawn_mower.pdf
    • https://uploads.strikinglycdn.com/files/a64f534f-7814-4bde-b430-4826e9a82cf5/59102278008.pdf
    • https://s3.amazonaws.com/libowebujakux/free_books_online_without_registration.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_ec4d289533f446308aa94f3aa39e0cce.pdf?index=true
    • https://s3.amazonaws.com/sepovutapakogaf/33919722914.pdf
    • http://pibanege.rf.gd/31643222931.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_3319de5eea704d6ab73f3cb41df1eeff.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_04dac4b780d84909bd861ee6c5cccc56.pdf?index=true
    • http://bebojivim.myartsonline.com/functional_grammar_exercises.pdf
    • http://raneluwet.rf.gd/35622703502.pdf
    • https://s3.amazonaws.com/vatosolikijike/82397021989.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_off0000f47c.bin
c7706c5cfa3b4a62051b4234865e9a5bc6dd5235a784c7899097c8993094bc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 4988 bytes
font_01_sfnt_off0001058c.bin
fef1465286d3248c9034105f93b3c44dd17fd719823641a2c41d03b0950c1a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 11024 bytes
font_02_sfnt_off00012b3c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 4324 bytes

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