Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a01a6fceb0ff7…

MALICIOUS

PDF

87.5 KB Created: 2021-09-11 21:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c172fe9e11b7f4dbad1a8af183a51016 SHA-1: ece3e281a17023926122dbcde27f09686da746b7 SHA-256: b16a01a6fceb0ff71360f2cc9edb0184b81ae31581f9fc438e61e4244b9240b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=discord+hill+climb+racing+2
    • http://think6.net/ckfinder/userfiles/files/20210901203520.pdf
    • https://infrastone.com/userfiles/files/62872328457.pdf
    • http://incomingmakedonia.com/files/files/retitedosoji.pdf
    • http://www.moyekolodin.com/files/febipelepejoli.pdf
    • http://philipsphotographystudio.com/95085970042.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a894c487e080d9446234de15764a3550/6851837687.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/jisalawafipuvikoduk.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/jopujuzubufudibowerid.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/naferekejelas.pdf
    • https://growyourmoney.in/userfiles/files/50047074705.pdf
    • https://matao.ro/app/webroot/files/userfiles/files/31766447443.pdf
    • http://charivne.info/images/file/fibawog.pdf
    • http://dansungsala.com/uploads/files/gagajepufupirodakezuxipew.pdf
    • http://caogenzhiben.com/filespath/files/20210902223245.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202199330565612.pdf
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdf
    • http://ourgans.org/userfiles/files/pagoxin.pdf
    • https://bbox.ru/images/shared/file/zodipofipetodorawo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8a77a01---64752579333.pdf
    • http://slsnn.ru/content/files/juxowetiw.pdf
    • https://ww150006.linebot.net/upfile/files/20210908140313.pdf
    • http://dogable.de/userfiles/file/94267079819.pdf
    • http://guss-ex.de/uploads/fck/file/14710894509.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3d.bin
b32800ced7b03ec728a86db06e550804b8625922b99e8dbdd6e7ece5f936dc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 18852 bytes
font_01_sfnt_off00011f82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16792 bytes
font_02_sfnt_off00013799.bin
c6ad2553b849801f355abc95c123740de3ae8c9f600a3e22a81ab3ee2bfd573d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 10848 bytes

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