Malicious PDF — malware analysis report

Static analysis result for SHA-256 d077cdf0090cd28d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 22:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a08ad4bb88af4a53a064323798c5f4f0 SHA-1: 6137eb5bf660f048327a06d755d2b6637a297819 SHA-256: d077cdf0090cd28d09ef794bb192d28ee1cc50beaf65e31c3e02fbd7290e6b3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to manipulate search engine results or distribute content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ryukatsu.com/userData/board/file/14337595224.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/nogegajaselize.pdf
    • http://furniture83.com/upload/files/88741680721.pdf
    • https://norservis.com/files/files/suxanonig.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c08435f19---24755148657.pdf
    • http://bagiez.de/userfiles/file/tedavibuzewosekavowovo.pdf
    • https://best-label.com/upload/files/malek.pdf
    • http://najlepsietorty.sk/uploads/fck/file/5974286126.pdf
    • http://jjmcp.jp/userfiles/Image/file/sixibafiwedopozux.pdf
    • http://acrclubinversores.com/files/galeria/files/bijetabudewuzut.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fgl88q7r254a6j56tmpvpser7q/solupipot.pdf
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdf
    • http://paramountswimwear.com/userfiles/files/nebub.pdf
    • http://greece-ex.com/images/blog/file/91646885535.pdf
    • http://murasakijr.com/uploads/files/levefabagevivemener.pdf
    • http://ablerexthailand.com/userfiles/files/65810712433.pdf
    • http://vinmexindia.com/uploads/58495017896.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/35409688071.pdf
    • http://faradbox.pl/files/file/22483151405.pdf
    • https://trainova.com/userfiles/file/lilixomibizog.pdf
    • http://fluitec.fr/ressource/site-image/files/sezurevulerezeberezaj.pdf
    • https://helices-evra.com/userfiles/file/tosonumaforawigojaxo.pdf
    • http://revize-elektro.info/UserFiles/File/wejegu.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rekokobebibugesidigorozor.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/zazirebejunodamazapum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+5+download+android+and+ios
    • 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_off0000e871.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 16792 bytes
font_01_sfnt_off00010083.bin
abf0d55bd9849604f53b07ec0e0fddd249cbf1f35a984c04e5805d3bd30683cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 17564 bytes
font_02_sfnt_off00012e4f.bin
f3ed5d8d20d048bdaf80cf45437359a173d1e408755bb7fddcd21d576bd4c37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 10368 bytes

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