Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5886e68e52d92d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 10:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81eece9577145ac1450dbf20e5bfa0bb SHA-1: 6426a5cae95c32e08f489617e52e217abb78e945 SHA-256: 4a5886e68e52d92de797d9ba5eed37145e2f8d683c4be04a0646a1773f44a10c
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests the document is designed to trick users into downloading further malicious content, likely by impersonating a software update or download. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly supports this, indicating the document's content encourages users to install extensions or updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=chrome+fast+and+secure+apk
    • https://newchat.xyz/js/ckfinder/userfiles/files/37314010202.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/benibu.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-2/20210902072914752264.pdf
    • http://tarnava.eu/user_images/file/4650431830.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/foxowipuguminokisut.pdf
    • http://leaguengn.com/userfiles/file///legof.pdf
    • https://tiemhoamo.com/data/dulieu/files/7051236060.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xupevepawaziv.pdf
    • https://uroci-kursove.com/userfiles/file/xajebozebo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a7c6d686ee9f9bf99649f13b050b56f7/zokod.pdf
    • https://ukmalayalamnews.com/userfiles/file/jutusebadavimetixenidafuz.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zitobisibugezerikesoxajod.pdf
    • http://eaas-journal.org/survey/userfiles/files/pamizelokojewowimujupaf.pdf
    • http://birzebbugastpetersfc.com/files/file/10294271132.pdf
    • https://viceda.com/userfiles/file/jusesu.pdf
    • http://imdad-egypt.com/userfiles/file/17678119096.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9dde37f2c75ad39d9f1bd3c9f84aa90/23268963095.pdf
    • http://rogersdesignhouse.com/uploads/files/37047415690.pdf
    • http://abbeloosschinkels.be/userfiles/file/53823827335.pdf
    • http://synowka.pl/galeria/file/79566015301.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zixokiwalujarexudoduxe.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/nerutef.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_off0000ef17.bin
e69a5f446142d2b2ceb01e09c9460632a252872bfcbb8d67ef69f15e635ff034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 18044 bytes
font_01_sfnt_off00011dfc.bin
7798e4d44b85d47b8711e162d447fc94dd564e54ee46a22bbef115e92ce64369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 10972 bytes
font_02_sfnt_off00013758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 16792 bytes

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