Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22bcc49b7de039e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 21:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ec03daed0ef761179a262300cd416ad SHA-1: 7391346fcbe85a4f32f8bf02eb4ef7b266a7b266 SHA-256: d22bcc49b7de039e4869ed387f0777ad3213226079d29bb2a7a77a8c596325c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hit-air.pro/ckfinder/userfiles/files/72503685734.pdf
    • http://www.armstrongre.com/files/files/bujujokurev.pdf
    • http://haphadoor.com/upload/files/95565716629.pdf
    • http://salman-is.com/userfiles/file/37729454519.pdf
    • http://flightshop.jp/images/blog/file/witiwumujeva.pdf
    • https://mokshadhamnepal.org/userfiles/files/69491294050.pdf
    • http://ottotech.center/userfiles/file/genixitexizukabi.pdf
    • https://lekkermooi.nl/userfiles/file/99770240832.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f91e24062---69219506964.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3671c5ff495449a37b9f8058995185f9/39139576634.pdf
    • http://lindendirect.com/tempimg/file/pagifaxutiz.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/walumiw.pdf
    • http://sistersaviopublicschool.com/userfiles/file/rofudasobivu.pdf
    • http://geometrabottero.it/userfiles/files/17313764884.pdf
    • http://csc0311.com/userfiles/file/20210908021018_hfjnap.pdf
    • http://yuha.be/_files/file/vurojikipinosineb.pdf
    • https://citrasas.com/ckfinder/userfiles/files/fadixe.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/12071324866.pdf
    • https://muzeumkonstancina.pl/attachments/file/44983316878.pdf
    • http://chi-kara.net/Upload/files/nuxexegajobivi.pdf
    • https://satellietgroep.nl/userfiles/files/24107317191.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=illustrator+to+pdf+color+change
    • 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_off0000d12f.bin
d3010ea7add5686041ac2d43b6f7f612d820bcc9bffb8f30d248b380e68f2b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 16796 bytes
font_01_sfnt_off0000fcba.bin
c5866ef72dc842e67e3d5a201639dd46f58ce3769386363dfd96bb3f1b05edfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10860 bytes
font_02_sfnt_off0001159c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16792 bytes

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