Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0df5960cca5eb88…

MALICIOUS

PDF

78.9 KB Created: 2021-03-24 04:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a94b88d4c957caf3203f48c69835717a SHA-1: 14e4d303f39791db655496bbb860dfcc29afa15a SHA-256: b0df5960cca5eb88e863c47cf28bc918a6fb226e041e06e3e3b865078fed096e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm pointing to 30 external PDFs. One of the primary external links, https://zajinet.ru/strik?utm_term=air+force+1+black+friday+foot+locker, appears to be a lure for popular consumer goods. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=air+force+1+black+friday+foot+locker
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/a6a7d.pdf
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5ff3c9eee4654.pdf
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5ff350df4ee6a.pdf
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/1961563.pdf
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/ce5e8206.pdf
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/5062240.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejexapef.rf.gd/tokamak_fusion_reactor.pdf
    • https://uploads.strikinglycdn.com/files/d491ca5e-7db9-4db3-aaf0-eddced6dfed1/kufudafejalezu.pdf
    • https://s3.amazonaws.com/rutufokedizon/90303556988.pdf
    • https://uploads.strikinglycdn.com/files/599377f6-9929-469d-81c0-00b40f01da28/16227203870.pdf
    • https://uploads.strikinglycdn.com/files/04093caa-0eca-455f-9d7b-9bbee044ece7/72351023040.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_a1846503459842c7a3d7723a120a8575.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2287918d-f1f4-4587-b59e-66a57684972a/which_states_had_a_flat_state_income_tax_in_2009.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_ac50b645d2344173839860e07df5e84b.pdf?index=true
    • https://s3.amazonaws.com/mijumomub/bcg_matrix_excel_template.pdf
    • http://lomipew.rf.gd/mimojuzesogilisomabe.pdf
    • https://uploads.strikinglycdn.com/files/87dbba4c-ba49-4b59-a5dc-43d842f1e1b4/34609042327.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5aa.bin
19782e8f6b92bd25da239d031193b7aac4428f4488758fe5b7dcca063892acdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5184 bytes
font_01_sfnt_off0001076e.bin
493c3dd2d1d8cfb7b3c6aac2ed5e298eed650f6d90ab9ed5445d1a33a32c4b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 11380 bytes

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