Malicious PDF — malware analysis report

Static analysis result for SHA-256 93abe037414e2751…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 18:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 361df27731dd277bfc7c70ce2c39b8b2 SHA-1: e146ae6ca3c8961bee5e69a829064d64ebd1fba1 SHA-256: 93abe037414e27518320ecc554afb8698b9c867a39ab8d1805d7e6b288fec453
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to evade detection or distribute malicious content through a network of disposable domains. No scripts were extracted, but the presence of external links suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=talk+mobile+apn+settings+android
    • https://gkatsov.com/userfiles/file/87277522302.pdf
    • https://clubkdo.fr/img/pics/files/ribizudidedolatoveti.pdf
    • http://gzhangqin.com/uploadfile/files/56134734484.pdf
    • http://constantcontinuity.com/membership/data/files/diluwubekorob.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/nofalufeb.pdf
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/barewujedafawisup.pdf
    • https://marikakozmetika.hu/editor_up/vizipekusoso.pdf
    • http://placidlakes.com/larpm/uploads/file/53957061141.pdf
    • https://cheesykeju.com/contents/files/22832805735.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/ledadigogirul.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2b169eb4f53a63d913e27cac6cfee004/xaxaw.pdf
    • https://kapefashion.com/files/files/xoboxuditagarusovijawepa.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/larafemirazesixeko.pdf
    • https://menlopark.com/wysiwygfiles/file/wakenulixun.pdf
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/91519337590.pdf
    • http://studiopignotti.it/userfiles/files/panemefabamorubigobo.pdf
    • https://questyme.com/userfiles/file/81678974192.pdf
    • https://primer-spb.ru/files/files/xilidovutulofedinumil.pdf
    • https://ratco-hardware.com/Ups/files/juwojasasijud.pdf
    • http://hydrem.ru/images/file/ruvukebefefupusuvopan.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/najakuvodi.pdf
    • http://www.cerel.eu/images/wyswig_images/file/pupujatubixilep.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_off0000d1f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16792 bytes
font_01_sfnt_off0000ea09.bin
b3e5346d9051e984b895b49f90b1b2ae9b8a131132441588f2cc719dc8fe8e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 10932 bytes
font_02_sfnt_off000102e4.bin
e8cbacb1efae0570cdd799e6ad9af90dd122c131a3c16c20e42ebaf446879384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 18236 bytes

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