Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60f39475283df54…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 18:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ffd811b14c3e6ad20314003723e87375 SHA-1: 285b4dff7abb503c4866f63745dc20665a8e7d09 SHA-256: f60f39475283df54249cd74701fcb23f5a02ceae87b501ee7073ceb24c81e22c
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL that redirects to a suspicious domain, identified as an SEO redirector for phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/strik?utm_term=bissell+cleanview+helix+filter+cleaning PDF link annotation
    • https://cdn.sqhk.co/sofizagumup/s3bgjV0/61774034875.pdfIn PDF document text
    • http://legionmone.xyz/53417687740ppea5.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/jdcidih/puvixinupuzewupo.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/pvFhbjh/tiny_calendar_daily_schedule_and_agenda_planner.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/XD4WNgc/89892746965.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/Ve589KN/60988309079.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/fzigidW/56831267654.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/iajc8xE/xbox_series_x_walmart_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zizene/jizuve.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/transunion_credit_report_vs_fico.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/whatsapp_status_tamil_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/94818347448.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/lagu_change_up_seventeen.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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 5412 bytes
SHA-256: 1d4de67874a77e03fbf38bede1dc4947e0ba03480e2231863fbed58cb293151a
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10112 bytes
SHA-256: d1517b8f9636f241077eef27b6aab84ba832bca979d89d42410eaf717f3c88df

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