Malicious PDF — malware analysis report

Static analysis result for SHA-256 130677dd5766d36c…

MALICIOUS

PDF

106.9 KB Created: 2021-05-01 11:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bd28ad73406ae9be68af16e81a2433a SHA-1: 4458286b8afe0fe6e0d71d2cff90a47ef0abba25 SHA-256: 130677dd5766d36c7d9cb8b98168af459197cdeeff19e5a24e31b1415b468b7b
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 pointing to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=how+to+reverse+steering+servo+on+traxxas+tq
    • http://xorabawik.medianewsonline.com/vejivakaveg.pdf
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/0735a08037f57.pdf
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/a760eb3cd1.pdf
    • https://dodoluwateja.weebly.com/uploads/1/3/1/3/131381806/naliluk.pdf
    • https://cdn.sqhk.co/xafemepino/3YsxQ3T/2532352754.pdf
    • https://cdn.sqhk.co/nudofarus/jikyUji/wordbrain_2_school_level_2_7x8.pdf
    • https://cdn.sqhk.co/dogilijesiwu/9hh6yl4/97038715687.pdf
    • http://tiwilofojifig.sportsontheweb.net/fuziwenesonu.pdf
    • https://cdn.sqhk.co/zosiwikiw/ghenhiF/lutarewok.pdf
    • http://madoxorijegobe.sportsontheweb.net/bemokuxoduf.pdf
    • http://dumubemajizukov.medianewsonline.com/widufokidiruvoboke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_3320f76634534db4a6043733a4184105.pdf?index=true
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_42514d8f0d8e42329f73d96b73e4014c.pdf?index=true
    • http://tiwogiponifi.rf.gd/tolarexi.pdf
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_6f5806de942b4efa80f1bcd6d3d9a039.pdf?index=true
    • http://raxagis.rf.gd/dutajumidutujum.pdf
    • http://rawozenagi.epizy.com/67893360296.pdf
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_6a3705f61b6442bd87d078852d815414.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_e286ed740f7246c38e292888050dedd4.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_dce8479c158f455e89b8e905fb0f7c1f.pdf?index=true
    • http://faxumodud.epizy.com/little_league_baseball_rule_book.pdf
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_7d24fc7e7cb247ed994703f3aa87834f.pdf?index=true
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_fbea9eb0478744d791c0db082c807353.pdf?index=true
    • http://vizepojuduw.rf.gd/gemomexadikavupevigato.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_off000161d4.bin
5c6bd2e338b93e63d8e818baaa6296fffcef694c6fb35596dc25f5fcce0b0127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161D4 5128 bytes
font_01_sfnt_off0001736c.bin
3d9dc3dfba120231077d2d18b13c74cede1a3b17459d9679243155a7118c10d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1736C 12728 bytes

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