Malicious PDF — malware analysis report

Static analysis result for SHA-256 b406a69e130688c8…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d64f3689f3d99bdd848d351f6f1d58 SHA-1: fc27f3dbe248e50d35510e1fa8ddc438b2315de3 SHA-256: b406a69e130688c89ccc87b54f39081c9498b85b50801432e4ee35fde557634d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studiogiamberardino.it/userfiles/files/tirem.pdf
    • https://vsevolozhsk.mebel18.com/uploads/files/80461478559.pdf
    • http://rqconsultores.com/userfiles/file/75524570179.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/86421686175.pdf
    • http://csc0512.com/userfiles/file/20210907120008_4dxjaj.pdf
    • https://lotusmarinevn.com/upload/files/51523856733.pdf
    • http://automsystem.com/UploadFile/file/20210905054809493.pdf
    • http://china-engine.net/ckfinder/userfiles/files/17501044388.pdf
    • https://zahidnawaz.com/UploadedImages/image/nokosivixaxofi.pdf
    • http://nadafashionbelt.com/Uploads/file/56412963266.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/16994665093.pdf
    • https://glamweddingdesign.com/userfiles/file/pisovawitafozinuluwegadan.pdf
    • https://altsovmun.ru/userfiles/file/bezijogufogurax.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/64983890625.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/1361016287.pdf
    • https://karolinanowak.com/userfiles/file/71799377406.pdf
    • http://sun-green.de/ckfinder/userfiles/files/67647078898.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69114914932.pdf
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/65402605596.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163133643340.pdf
    • http://olymp-kiev.com/temp/fckeditor/file/wuwolatowiragugodaruwi.pdf
    • http://grawerlik.pl/userfiles/file/21776604086.pdf
    • http://zhuoer.ltd/userfiles/file/98985251176.pdf
    • http://bluebossa.pl/files/file/kixetofodatiti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=no+limit+drag+racing+2.0+ios+hack
    • 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_off0000bd4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4C 16792 bytes
font_01_sfnt_off0000d563.bin
84181d880ef9f592d3fbfc743714737e0b7550fb0de0d10620a917d6b0807468		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 11064 bytes
font_02_sfnt_off0000eec2.bin
f04c772c8f0170d4c66bb6b034327ad29288b01d173d3b2d3913ddac1c7c995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 15844 bytes

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