Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f96db15cf7e9efa…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 15:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd153c0b3a2adc2daa2382929006058c SHA-1: 4a9655888d67296dc2a46a2335416c18e9811e2a SHA-256: 8f96db15cf7e9efa6da0b3a8477816d6106876917cb4dd245482b36074fde77a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://autoscuolauniversale.it/userfiles/files/52524796776.pdf
    • http://onlinevay.com/upload/files/gifulirawuluronafili.pdf
    • https://caror.hu/ckfinder/userfiles/files/keporukemitepejadum.pdf
    • http://karat-dobremiasto.pl/userfiles/file/52219172839.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/megatekixasokexagapolope.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67205079861.pdf
    • http://oldstat.ww.tj/img/file/83942190504.pdf
    • http://rentbucharest.net/images/userfiles/5683748207.pdf
    • http://immobilieninvestors.eu/userfiles/file/zefam.pdf
    • http://physocare.com/Images_upload/files/supifikedixefatar.pdf
    • http://liebherr-tr.com/userfiles/file/badilakizakutuvufodeberok.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/38856789005.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kurofudidesivubajozu.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/65864786669.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/jejusiz.pdf
    • https://sentinels.ro/userfiles/file/81747658646.pdf
    • http://ltptech.vn/uploads/userfiles/file/rijufududozelesosa.pdf
    • http://baggiez.net/userfiles/file/70922524326.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mqu8h7nknil731ta4vig7mjut5/xufesenozivokoten.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mortal+kombat+armageddon+download+for+android
    • 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_off0000aaf7.bin
3bacb86407681d77d51ffd6544033c3ecb4f37f8d4271580cc0b4acea1997222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF7 16340 bytes
font_01_sfnt_off0000d46d.bin
206b2c1ce76e97a731910a5181997426b5d3842facd0bf12939ffc7d56d69110		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 10840 bytes
font_02_sfnt_off0000ed4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes

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