Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f305a33911fdd6c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 14:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cffe56cbd1958e5cd5b4f2bc7fcd69a SHA-1: fe056ebcf82d8c2c0470af7e4596abb277aa5b7d SHA-256: 9f305a33911fdd6c5e6dcbd2da01246139d0c2e5285bbaa2b4856d46da50c005
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests these links are used to obscure the final destination, likely a phishing site or malware download. No scripts were extracted, but the structure and URL patterns are consistent with phishing or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://norservis.info/files/files/bixerad.pdf In PDF document text
    • http://auburn-companies.com/userfiles/files/22477791517.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/46573668506.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/38006087495.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/kuzebopi.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/14300811236.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kepegebigigoravekifotur.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e42489019c5d25f114cee3369265c455/zunafanukujoli.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kovovatetipumepifu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/vuwurozad.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/89805719034.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0d039019---gejunolefi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/29465671528.pdfIn PDF document text
    • http://swhos.com/upload/files/81288978195.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73441833868.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bawekul.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/87083927276.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19252825136.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210916141400_a36ffx.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/gozipet.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/56947051212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hbo+go+android+compatible+devicesPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 14836 bytes
SHA-256: 15a9ce69600cf4c24c2a61e3d48a1cef7dc795580f0b47701c74cf91d6fbc43e
font_02_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 11052 bytes
SHA-256: 22c50dd58187f1db9598cc6662ded5fe69e14f515371b5ca3499f5412ece0103

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