Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae25c32f1b5e9b70…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 22:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407f0f8f3bf1eed921550e0e1e6068c9 SHA-1: a1b365a1d2303da5338a7c91c475e1bac4b2bc5e SHA-256: ae25c32f1b5e9b70e9b917ff7770650c8bf35a693a6a3e5e97b8125c67a3b10f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sanidom.pl/img/file/pasodamebabidajikaj.pdf
    • https://guanlai.tw/uploads/files/202109092147401198.pdf
    • https://iuoshili.com/upload/users/files/24969730530.pdf
    • https://tamphuctriland.vn/upload/files/wuxam.pdf
    • http://moutierrozeille.fr/userfiles/file/68378304909.pdf
    • http://hoilhpnqbthanh.com/upload/file/97111815593.pdf
    • http://www.elstar.ru/uploads/files/56573810557.pdf
    • https://brakos.it/file/fexidefej.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pupelujetapilepir.pdf
    • https://morethancars.eu/uploads/edytor/file/44304753564.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/totivutewititobemoz.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/91060845097.pdf
    • http://cdkkck.com/uploadfile/file/20210907125613.pdf
    • https://guijek.com/userfiles/file/woras.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa4d24c62.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/tapatorivajiniva.pdf
    • http://chinalanpa.com/images/upload/File/90126722316.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab740981e---gajifizovelowiru.pdf
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdf
    • http://ctcinsulator.com/uploads/file/26339731298.pdf
    • https://kingbakerypans.com/userfiles/file/viwawupeni.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/89438134673.pdf
    • http://195exim.com/datas/files/xusazeneni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=messagerie+vocale+visuelle+bouygues+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_off0000cff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 16792 bytes
font_01_sfnt_off0000e802.bin
c082578cdfea972d7ef3dd1d6cc175c4429dc45e98455bc54db7367351a21801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 19584 bytes
font_02_sfnt_off000118dd.bin
f9a334bcaad70e8c126827d50e16ca734039824917b068527477f0f275b00d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 10860 bytes

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