Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3816316e10d0901…

MALICIOUS

PDF

86.9 KB Created: 2021-02-28 04:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2bf68bfbf64928e585833149675702a SHA-1: f024624b4f27f1acfb8cc5b1933c05ea02d8a30b SHA-256: a3816316e10d0901068bbbb4aec859af4dd00adcc53f2c8328ff5cc796b0645d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the PDF link farm heuristic indicate a strong intent to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness, supporting the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=fluke+177+179+difference PDF link annotation
    • http://gufutaca5.xyz/gakiwulonotonipesodapudawom0p0.pdfIn PDF document text
    • http://universal-kirov.ru/jodefofewikenajamesme1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459035/normal_6006e49b6ed97.pdfIn PDF document text
    • http://nukicew.xyz/90504316817se1oh.pdfIn PDF document text
    • http://interplast.ru/52888534575s2c12.pdfIn PDF document text
    • http://iqecoportal.ru/59938445489ufn2j.pdfIn PDF document text
    • http://raifaisentgo.online/xofubigikegusimugarepezamrmb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fe7422e9481f.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/TEjjSf6/fruit_master_game_download_uptodown.pdfIn PDF document text
    • http://blubadgehelp.net/zotenopuwixoxkfgah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_60136a328c55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60296530bf2a6.pdfIn PDF document text
    • http://minuette.me/wow_legion_mistweaver_monk_pvp_guidepd33x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 4932 bytes
SHA-256: b190a428bfd3e1ad272d57f106ee519e3917f9a44eba1fff2e78f7a622c4e82c
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 11352 bytes
SHA-256: 775e414c905f113e0be27806f72129bc937eef61d2b0c9939b340c09bee1f252
font_02_sfnt_off00013906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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