Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd4fab088948ac0…

MALICIOUS

PDF

83.4 KB Created: 2021-03-17 09:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29b8f455541548229cb3efb4b7c3bb3 SHA-1: 23fc5b75c1f854503739b11491b334b6f3690d8f SHA-256: 4bd4fab088948ac02007a384d0c8485f42394e4b82da13499374739903c6faf4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as SEO-friendly content, indicating a link farm designed to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

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://pelibifir.ru/wix?keyword=clash+of+clans+mod+apk+free+download+pc
    • https://cdn.sqhk.co/vitimosugu/c9jjgcA/the_history_of_hockey_game.pdf
    • https://cdn-cms.f-static.net/uploads/4475864/normal_604a5c736d22c.pdf
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/9913298.pdf
    • https://sefoxobifi.weebly.com/uploads/1/3/6/0/136093232/259de2.pdf
    • https://cdn.sqhk.co/bogovureg/1UhcSZB/island_lake_camp_starrucca_pa_18462.pdf
    • https://cdn.sqhk.co/mewuwemiromi/geo5Shh/artificial_intelligence_a_modern_approach_4th_edition_review.pdf
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/rafotok.pdf
    • https://cdn.sqhk.co/damapegapi/cieOgge/sobewovofeja.pdf
    • https://cdn.sqhk.co/bedazume/yghijhb/texas_gangster_rappers.pdf
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/9305265.pdf
    • http://gemubanabugawa.mypressonline.com/favemoxobes.pdf
    • http://bometaximom.scienceontheweb.net/what_is_dependent_development.pdf
    • http://bimizuzi.sportsontheweb.net/89428004315.pdf
    • https://cdn.sqhk.co/soziwariru/iicieqN/30073109522.pdf
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe580b76253e.pdf
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fff26f8243ef.pdf
    • http://vugekowuzujed.scienceontheweb.net/25262187232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bolirazebaf.myartsonline.com/72344548602.pdf
    • https://s3.amazonaws.com/wunojipu/19353241888.pdf
    • https://s3.amazonaws.com/jobavo/penolebolat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2dc.bin
15564840332c6ecd4c3852d378aa50d6784c814d93f6042f9c7465ba4832c1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5456 bytes
font_01_sfnt_off00010551.bin
481c5cae1c71e86334d63324ec3428a447991b5adb7c393cadbb632401840aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 10648 bytes
font_02_sfnt_off000129cd.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16312 bytes

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