Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45fc8d0009fdea2…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 12:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5138ef8da990e68c9f30382ef170bbe SHA-1: 3f7bde7e34c0f7ba01c0934ae6692b8d01f5f054 SHA-256: a45fc8d0009fdea2452c140e72cce936b2f5fcead0093228ea6012b93b6c6396
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://shopsuathientu.com/uploads/userfiles/file/ruwokamu.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614625bea769f---pegide.pdf
    • http://askort.pl/Upload/file/lobibabokebulefijaj.pdf
    • https://szallas-karpatalja.com/upload/wuliwu.pdf
    • http://apcmagon.com/userfiles/muvaxifabonupeveloka.pdf
    • http://driscollandgibson.com/images/edit_images/file/33577183474.pdf
    • http://ch-bovi.com/upload/files/guzabuvivifetekulisuv.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/niwogagube.pdf
    • http://kleinschaden-expert.de/userfiles/file/lezusam.pdf
    • http://dobrasekacka.cz/userfiles/file/50422259889.pdf
    • http://jjburgerut.com/uploads/files/gifidomivomuw.pdf
    • http://olympicburger1988.com/uploads/files/mawukejepatogugi.pdf
    • http://obasekiestates.com/UserFiles/file/kejodegijet.pdf
    • http://rococosofa.com/files/files/31095195575.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210925_91CE89F8496A621E.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c27d994d2---kexetakelojexiluxa.pdf
    • https://dancleland.com/img/upload/file/77155483095.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/2885654518.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/37913535380.pdf
    • http://lawfirm.vn/MINH/user_files/file/98185904644.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/83219718838.pdf
    • https://warungmimpishio.com/contents/files/goxijivofu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=4+letter+starting+with+z
    • 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_off0000d8f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16792 bytes
font_01_sfnt_off0000f10b.bin
02aa33c04bd366f64caf0933b832df4f5342cf540a162f6eed5abd2788b0ee43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10392 bytes
font_02_sfnt_off00010890.bin
93ab079cffeec0b7d92170f63c8f75c07c580692e997a8a7e7eb60db43fabc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 19752 bytes

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