Malicious PDF — malware analysis report

Static analysis result for SHA-256 7926d1964b31df91…

MALICIOUS

PDF

79.0 KB Created: 2021-04-22 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8320043cd3d46ee1d8b3104e9677ae5e SHA-1: 200886f7023d3cf7a87540609a3a8bc950e992a2 SHA-256: 7926d1964b31df91da8ad12358d382a54b57685a3ed87f435c0ca394152a8fa9
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for specific keywords, such as 'Netgear ac1750 wifi cable modem router wifi not working'. The primary malicious URL identified is https://botokaw.ru/strik, which is likely used for phishing or to host further malicious content. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful websites.

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-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://botokaw.ru/strik?utm_term=netgear+ac1750+wifi+cable+modem+router+wifi+not+working
    • https://cdn-cms.f-static.net/uploads/4496824/normal_6054063e105f2.pdf
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fdd3846a516f.pdf
    • https://cdn-cms.f-static.net/uploads/4467017/normal_5fdba30e9c395.pdf
    • https://cdn.sqhk.co/jibenapola/RCMG7i1/bedizuterudeb.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_604e1aad96a60.pdf
    • https://cdn.sqhk.co/pimupigedu/TjfJrhj/khan_academy_math_5th_grade_multiplying_fractions.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5fd9398f44e58.pdf
    • https://static.s123-cdn-static.com/uploads/4367961/normal_5fde6228f2d37.pdf
    • https://cdn-cms.f-static.net/uploads/4410674/normal_601036ac8680f.pdf
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fefbc3d61694.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_605ada74501fa.pdf
    • https://cdn.sqhk.co/vomawoko/gqhg2bR/gibetuxolabogede.pdf
    • https://cdn-cms.f-static.net/uploads/4476782/normal_606887ba08b1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_15b2f4b52dad4da3b8f9137a5cab7a43.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_9b2dbb9e6d7e4ed58c7a4adcb97ba893.pdf?index=true
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_088e946d7f7543c5a9a0f7eb1bdd237b.pdf?index=true
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_e050da7c707646a2bc3e32d55ac4f0ba.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_off0000f42e.bin
aaa62ea08134a7b85f6334878e1f0f3a2f40241a263e74dc8467680b7b449eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5824 bytes
font_01_sfnt_off0001081c.bin
e9626f79ca54a676423c9b6a69eae5acb82bed653899c763351960feb51ec301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 11484 bytes

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