Malicious PDF — malware analysis report

Static analysis result for SHA-256 665b1ba61cd1a33d…

MALICIOUS

PDF

77.4 KB Created: 2021-05-06 23:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97558e91dceff15f18d997d277736637 SHA-1: 76c133c001a79a3e00f249673297884354157081 SHA-256: 665b1ba61cd1a33da85500c2e43448177509d485e185d6bbe022bfe4b0115c2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://jacksth.ru/strik?utm_term=how+to+install+new+battery+in+smoke+detector
    • https://cdn.sqhk.co/pozuwifofub/igHEig0/gamemaker_studio_2_vs_unity_2019.pdf
    • https://cdn.sqhk.co/puranajav/jjilZii/vocabulary_a-_z_discount_code.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5ff2f076548d5.pdf
    • https://cdn.sqhk.co/vilitemeru/ZhiLhhL/47088922552.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_600e89d4539b3.pdf
    • http://xesesevatep.22web.org/calories_in_a_quiznos_sub.pdf
    • https://cdn.sqhk.co/mudinaxape/gdidUig/pujule.pdf
    • https://cdn.sqhk.co/muwanije/zdrIjjV/kukajugupu.pdf
    • https://cdn-cms.f-static.net/uploads/4382192/normal_605514ddcd63f.pdf
    • https://cdn-cms.f-static.net/uploads/4490735/normal_6014928fba7dc.pdf
    • http://nelawetazabuta.66ghz.com/poriwizaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc5436c1-ccc1-4df5-9dae-885fe8c83933/jedimexi.pdf
    • https://uploads.strikinglycdn.com/files/5bd3ea4e-205a-4bcc-8537-4d1cb4df1cb4/ensayo_sobre_el_mundo_de_sofa_pelcula.pdf
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_cc128f91817d4c1d9f28dad148060076.pdf?index=true
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_d544913f991f41159a3e46dda305ac91.pdf?index=true
    • http://sinodigewenewe.rf.gd/the_world_almanac_and_book_of_facts_2020.pdf
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_0680d1834b474a439d77f7dbb2710c05.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_e44dbff8570f4d42a6e63533c3c3689f.pdf?index=true
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e5df0979a1d84bbaa31074f4d2aa72b1.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_off0000ed81.bin
78528fa36b991ec14610d8aaa090dcfb9e23ce029cc410730b341e2fc9779216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5444 bytes
font_01_sfnt_off0000fffe.bin
c5ded64fb7677c86325c4fe7544dae3946b02279308084efa1d2472b22fa7343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 11200 bytes

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