Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4c6d1c7d5a2c0b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 18:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93178353c04e26802e496fa95dca5281 SHA-1: d39351f39cc499c3b9c7bd8cb75b873f509b2f43 SHA-256: da4c6d1c7d5a2c0b74b69b449fb2f7e25b35c48b00845cac521ba0dfbbf3214c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bisenzia.it/userfiles/files/bebigerukagasumadogufe.pdf
    • https://sarvodayasamaj.uk/upload/files/68328597104.pdf
    • http://lgassociates.in/uploads/sewimes.pdf
    • http://optikametuje.cz/userfiles/file/3854593462.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/vosemurowut.pdf
    • https://lenaoyunlar.net/calisma2/files/uploads/monukunanaz.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210901083555.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/90083381742.pdf
    • https://serka.com/serka/upload/files/34542250550.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jomaxu.pdf
    • http://mikomisushiwc.com/uploads/files/85017342133.pdf
    • http://urduhadith.org/survey/userfiles/files/80274919497.pdf
    • http://tgroupsrl.com/userfiles/files/vuzevosexiwexi.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/boxazixorenonar.pdf
    • http://gernano.eu/gfx/userfiles/files/butulawiga.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/sexagu.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/nowosafigul.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/72774308067.pdf
    • https://ww150001.linebot.net/upfile/files/20210912040101.pdf
    • http://computer-rudolstadt.de/upload/file/27299263614.pdf
    • http://foto-klub.dk/userfiles/file/dowitizanidubeje.pdf
    • http://abovomedia.hu/_user/file/tewozogerogatazuxes.pdf
    • https://triangle-electronics.com/assets/userfiles/file/66349925851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=friday+night+funkin+piano+game
    • 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_off0000ba5a.bin
69844e385c03a81aeef55dffdb3d249f9eaff62dcb2152808d133106b4154851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 18392 bytes
font_01_sfnt_off0000ea44.bin
6f44f0a9f6eb4f0d1c7ab5d6b978b686b26179741d589ac442ff27ecd0c08e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 11012 bytes
font_02_sfnt_off00010378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16792 bytes

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