Malicious PDF — malware analysis report

Static analysis result for SHA-256 373ad48f45703190…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 20:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9612ab6ecf1864ee9e22b407b350e03c SHA-1: 49390f59b63163d7a89bd64dd2d55e49eed3917e SHA-256: 373ad48f457031900b919d71a057c921c0e878c303a759f282709dd91a4e3cac
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary one pointing to 'druttle.ru', likely serving as a lure to a malicious site. The PDF's structure and content suggest it's part of a link farm designed to redirect users, potentially for credential harvesting or malware distribution.

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://druttle.ru/strik?utm_term=vampire+diaries+season+1+episode+18+full+episode PDF link annotation
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/xokalireziw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5ff332b485cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_6033fc4b6afd9.pdfIn PDF document text
    • http://botumizesakukij.iblogger.org/44422843600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_60341ae8cf268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fce7dc5143bc.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/MbigIcz/forgot_screen_time_passcode_ios_13_without_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/v6UUicx/61473275489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff0404e8149c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fe8104243329.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/M424Gji/24526720643.pdfIn PDF document text
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/3888d50d6c02.pdfIn PDF document text
    • http://mazoxobiziwikut.iblogger.org/artificial_intelligence_powerpoint_presentation_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/fjfifNA/the_trip_to_greece_rotten_tomatoes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumasadepa.epizy.com/compliance_report_writing.pdfIn PDF document text
    • http://lesuzikabe.epizy.com/kulokexadirepota.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5400 bytes
SHA-256: 19702a0a3a10bff8d0b6118498988949dc74e244554958c49503996645f996e5
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10316 bytes
SHA-256: 2772e010f1e68aa6b76d750996cb298210d924f21ac90718eac7cf3d92164688

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