Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0f0252959d47c5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 13:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b28f677b4958ade5fcfbc8786d36ed5c SHA-1: 52c58be3f8e844e80291a95b83adc46e6b660d12 SHA-256: ca0f0252959d47c57ca4fce0ec8e9a628899111d4dcfa574eef190c8b29cb830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://abwlanham.com/uploads/files/lulizakemotaribokuzad.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bokamupuxivebi.pdf
    • http://nationalherbo.com/userfiles/file/daropesedunasibukali.pdf
    • http://tetrafluoro.com/upload/files/vigomepixobipigisij.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/feboru.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/busarowawor.pdf
    • http://sfipl.in/userfiles/file/napazalunefojijeramadamuw.pdf
    • https://internationalmedia.com/userfiles/file/xifub.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/95891727031.pdf
    • https://legend-chang.com/UserFiles/files/nupovefonaw.pdf
    • https://onlinendttraining.net/files/52951236453.pdf
    • http://imi.vc/upload/files/nojevovedineferiledewe.pdf
    • http://neonatal-surgery.ru/userfiles/files/guvegup.pdf
    • https://alatheir.com/atheirwsfiles/file/40773582481.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/bidajubigofosinupitiv.pdf
    • https://rougezenekar.hu/files/file/xosuwusafebilovaxutir.pdf
    • http://alda.pl/ckfinder/userfiles/files/27175728888.pdf
    • http://www.jindatunnel.com/up_files/file/52988934524.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wujawukobewavevitizavebe.pdf
    • https://stillwaiting.org/userfiles/file/lewosebem.pdf
    • http://lionsmarsala.it/userfiles/files/pufalemibonajufumo.pdf
    • https://kocarbonag.com/luutru/files/19627088911.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dua+for+sick+person+in+hospital+in+arabic
    • 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_off0000aed1.bin
bb0ae7766b06a0c72de04b646b4de3671fc798538b56d9e23f416e98340d368d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 15244 bytes
font_01_sfnt_off0000d4f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 16792 bytes
font_02_sfnt_off0000ed0a.bin
28f1e1cd02d1562c734c13dcf233a84d1c656885f0c61197196d2ab76143f534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10908 bytes

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