Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94c2d12bf99bd1d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 01:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 003c048a5e3527ca79c5d29666cfff08 SHA-1: c87f8fe5bb8b19d1e76a21aa07c1fef5b6db489a SHA-256: c94c2d12bf99bd1d37ae6014d29b3fd8fc23cf8c633ee6a32a7faf883737a73a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medica-eg.com/userfiles/file/99533695518.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-15/20210915185721656253.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/24597102869.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/58544953089.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_121222.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dajolo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/76632852223.pdfIn PDF document text
    • http://epicridesnepal.com/files/23696491443.pdfIn PDF document text
    • http://dgkno.cn/upload/tepuwobopotovuderewufusif.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/lituvamel.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/11555591252.pdfIn PDF document text
    • https://websbag.com/uploads/files/lufase.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/jubexewabazulikaraw.pdfIn PDF document text
    • https://felicityokolo.com/file/gutoba.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/93621011858.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xomuvurodasevetov.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/dupetasotiwur.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/83050593900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pdf+scanning+software+for+windows+10PDF 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_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 19524 bytes
SHA-256: 915db4d2644bfeeeac3f948925d1da9e7a7d6ad4b44c4b15df6192f17976d402
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 10868 bytes
SHA-256: bba50a9686605b7be0cb736b82d1c8e07082f0a482b91a09aec36cab8d781722

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