Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad09d02a90a191b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 19:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4fe047cf61a304ef6a51646fa5d9b43 SHA-1: 5e81b3c8cc6ed90907589b92d8ad077ccab09724 SHA-256: cad09d02a90a191b0d975e4944d88182e0e79e802b49982e52079c8c37e80430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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 https://businesslife.com/content/files/bonapipuvebo.pdf In PDF document text
    • http://topbuild.net/content/xuploadimages/file/xodagajoredelafodoluzu.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/97366701320.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/vasudi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/91790208468.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/73945960919.pdfIn PDF document text
    • http://theponghop.com/upload/files/vutalasozedugan.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614956bb6f4e8---wogodawekoniwomodizizoz.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/vofasowawedowe.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/28742430920.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/32004095715.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/lipurizufunewidik.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/40877748740.pdfIn PDF document text
    • https://sainaudit.mn/File/diselokesixuf.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wisekukile.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kizunimojad.pdfIn PDF document text
    • http://taichielite.com/louis/taichi/ckfinder/userfiles/files/79945952583.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/zemijigifug.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/96270671931.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/65355109044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=google+konto+android+synchronisierenPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 16708 bytes
SHA-256: 900a898c31135e27fdaf13b02d138c7680925727489538bbaee5be51761bc34a
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10896 bytes
SHA-256: 71a14138b6c76e875164cc19500c8fb22926334df5159b3f25c7c2d967d1c3fe

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