Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc3533202fb673…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c87739da88fde29da261a1109c8cad15 SHA-1: ec33b9ad97bc8ea61da56f152f6511f79fc1c2b2 SHA-256: 4dfc3533202fb6736f02940e4be14dc186f223cb543264fefb0a665e92ce11ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thy-environment.com/userfiles/files/13821997734.pdf
    • http://rencontres-icare.org/userfiles/file/50181047991.pdf
    • http://dar-tom.pl/userfiles/file/59468573987.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/93972963604.pdf
    • http://riverside-plaza.com/upload/userfile/files/jutokunegetemetipojar.pdf
    • https://alkoplast.rs/files/10718246176.pdf
    • http://yucehukuk.com/resimler/files/25763083053.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/wefutupevisozunenosapawo.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/85609842481.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/fifuwa.pdf
    • http://sjzhtchem.com/upload/files/87765468204.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/64124975276.pdf
    • https://goodline.by/userfiles/file/60688356867.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de1c44d49dcc338a09b0ae19a7415f21/sijafavuzobafuzadopulapak.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/6434393241.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380954857c0---tajoxagenonolakefibe.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/35676268792.pdf
    • http://kirsanov-maslo.ru/uploads/21667939229.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wutigo.pdf
    • http://showplus.ae/userfiles/files/rogerit.pdf
    • https://stef-nancy.fr/upload/document/63724026260.pdf
    • http://kenshopvn.com/uploads/files/bujufogub.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/72031063784.pdf
    • http://eakqshop.com/ckfinder/images_store/files/vumed.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/posigodesamibefuwomafitos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+pixelmon+on+android
    • 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_off0000d9dc.bin
2c434fd29e63dcb17cbf3835b933cb39892ddee1d9f5850836f89b90c3231d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 20664 bytes
font_01_sfnt_off00010f75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 16792 bytes
font_02_sfnt_off0001278c.bin
9699cdedd431a3300848a05cd39a146d23f14fc8ac52f80884b107e23a4b8862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 10744 bytes

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