Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a09cc422a3e1a6f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b6a95440a23cbd564094cd0e37069ef SHA-1: a31a46e7c1b5c3220c8f9587c98b2662b09488bf SHA-256: 8a09cc422a3e1a6f51248c527a86583822df1518e7c02d51812546ad894a0683
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=the+walking+dead+season+9+episode+11+watch+online+free
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613810d3f0fc6---palufidadamibis.pdf
    • http://otohyundaidanang.com/uploads/image/files/wonuxasadabanojutuz.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/31871884033.pdf
    • http://orikon.net/Images_upload/files/13490615771.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/65986141622.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a2d224ec---49392567056.pdf
    • http://melly-incendie.fr/img_db/faborivixutiruwijigew.pdf
    • http://ain.proximeo.com/ckfinder/userfiles/files/sogojo.pdf
    • http://lynxauto.ru/userfiles/file/28399327195.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dulukusatevojojaw.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97527141787.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/47867772775.pdf
    • http://mrpokedb.com/uploads/files/52800019098.pdf
    • http://dainichiji.com/upload_ckr/files/fofobebaxozagatetuli.pdf
    • http://badaranquehablar.com/userfiles/files/bonugenezepoxa.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/87738099242.pdf
    • http://siamintertrade.com/file_media/file_image/file/tijutozi.pdf
    • http://termosystem.pl/userfiles/file/navijugil.pdf
    • http://conelser.hu/fck_uploads/file/95362925517.pdf
    • https://riminabda.sk/userfiles/file/99289048030.pdf
    • http://superfishinglewood.com/uploads/files/nusipobivuxog.pdf
    • https://aldapa.eus/files/galeria/files/5954367370.pdf
    • http://nktrading.qa/file/files/27318897375.pdf
    • 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_off0000de4f.bin
afb6c3515ae9bcf11295eb4bfeeb0d995dca9b1731fb6b80468a80ad57634861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 17380 bytes
font_01_sfnt_off00010bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
font_02_sfnt_off000123df.bin
f91e1760bc1f1e6f1c14acc4b9e5b80fcbce3e3a74c8cfc21829b48810e8ce02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 11260 bytes

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