Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f84867fa943bf5b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 02:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49150389c1daa57a89408551a7974b08 SHA-1: 34f1876bad385148a8ac529a617d9790b4da099a SHA-256: 2f84867fa943bf5ba45c9b56659c3a692054c3c4b661b3756d2886fa9f374287
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true destination by using many distinct hosts with few links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=android+keeps+dropping+wifi
    • https://restaurant-kamkok.fr/img/Data/file/fisuwoxipelofaterumew.pdf
    • https://organicearthfiji.com/documents/file/vigolosegisijexutekoni.pdf
    • https://client-sms.com/ckfinder/userfiles/files/wopitak.pdf
    • http://malbreil.com/userfiles/file/lelujomekomilufi.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61065446216.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/98540194797.pdf
    • http://abwingsva.com/uploads/files/nelevijalilarekaxemewidi.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ac68d519---miforebazasujosu.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/20516052999.pdf
    • https://allora-tour.by/var/upload/file/gavaxafowirepitexoguziwir.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0c47e3b8---zubogokapibukanigalazuru.pdf
    • http://kaies.cn/upfiles/file/43546132684.pdf
    • https://vaynhanh365.net/contents/files/71496704925.pdf
    • http://www.tokyomagic.jp/images/library/File/87565645175.pdf
    • http://aeusjtu.pretty-match.com/upload/files/ludujakokore.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/20013901367.pdf
    • https://girl0229960192.com/upload/users/files/jofazerajidekofuse.pdf
    • https://powermailer.in/userfiles/file/26889229370.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/36627222854.pdf
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdf
    • https://synodradomski.pl/userfiles/file/donebulerovizomotonoko.pdf
    • http://www.motionmantra.com/userfiles/files/84235108812.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vojuwezunugederapaxarit.pdf
    • http://imhang.com/fckeditor/userfiles/image/tubakekerotefadetexeja.pdf
    • https://mccartha-cobb.com/userfiles/files/29123501141.pdf
    • http://baby-daycare.com/uploads/files/202109042303518433.pdf
    • http://akademibt.com/resimler/files/rilorodow.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_off0000c558.bin
961627024e95c4f13f4c03f0903b8096eeee4d9126f9fbc16a318805ed687cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 16432 bytes
font_01_sfnt_off0000ef98.bin
c63e493c3fc3bfef77ec81d2658a76201629486e5c77c9d95994d9c874945888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10524 bytes
font_02_sfnt_off00010781.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 16792 bytes

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