Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b85e8548d0abdeb…

MALICIOUS

PDF

76.2 KB Created: 2021-02-08 11:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8f577f5560c91028bf1b02033988f266 SHA-1: b88947e59ac1439d75e7ee42ec571e723571adff SHA-256: 6b85e8548d0abdeb829e84f1366a5fcf0302c4fe2c2273c620dd8cf1be70f8d8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URIs are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=balance%20sheet%20analysis%20with%20example PDF link annotation
    • https://cdn.sqhk.co/vaminika/uiiroic/onelogin_protect_app.pdfIn PDF document text
    • http://arbitestpark.xyz/giridubevinodasnn0xq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ff05d2df3834.pdfIn PDF document text
    • http://dixojele.22web.org/kewatolurewesadekorepa.pdfIn PDF document text
    • http://alisaborodaenko.design/sort_ascending_crystal_reports09dy6.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/f0VibB4/frogger_2_gameboy_color.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/wvlhh59/twitch_alert_sounds_free_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/ahj32hc/graphic_design_software_for_mac_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/jyheuJ4/muvokugepoz.pdfIn PDF document text
    • http://ru-payment.casa/43352326969s8hsm.pdfIn PDF document text
    • http://proflist-briansk.ru/flipped_book_theme3kxdq.pdfIn PDF document text
    • https://cdn.sqhk.co/datisafapuv/gdsjdmq/most_difficult_games_to_run_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/Tehhajg/74422810047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulanikigog.epizy.com/lesakasaguza.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/28651303083.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/liwikijaxukolumubopimi.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/wevubadoferogibade.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 5388 bytes
SHA-256: 37871df83aaaa0828329974bc176e08547dd7514abe31cc9c5464dc7a5b72c13
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 11176 bytes
SHA-256: a484b214cb9c3f2e3e377bcef984b60f7d2f9938de31142ed282c61e6d7b5319

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