Malicious PDF — malware analysis report

Static analysis result for SHA-256 894d6fc192a715a8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 18:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e415b3728504d2936b5c635a9c390c8 SHA-1: 31c53ad60c27247977d7add8ea09e982f15c7d6e SHA-256: 894d6fc192a715a8fe394d31728a52b49683790bc2cf3807b6d34865a0065ddf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics, which are part of a link farm on disposable hosting. This suggests the PDF is intended to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://wastran.ru/uplcv?utm_term=method+of+teaching+business+subject+pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16130814f392c3---2794890495.pdf
    • http://agro-norwa.pl/userfiles/file/wewuketizusesa.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210902_520320FF0CFF26F4.pdf
    • http://joyear.com/ckfinder/userfiles/files/tozimevividijuvaluguvu.pdf
    • https://remont-bez-zabot.ru/files/file/90081500360.pdf
    • http://osc-pribor.ru/products_pictures/file/tuzaguvikopenewefa.pdf
    • http://restaurant-lyons.fr/userfiles/file/jisefilorivirupabopawu.pdf
    • https://aathichudi.org/userfiles/file/87184005095.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/12036615158.pdf
    • http://werkkledingverkoop.nl/images/docman/files/94219683628.pdf
    • https://gregoryshow.ru/files/file/vovapubepewozedo.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/83487875265.pdf
    • https://awinresource.com/uploadfile/file/vatepanaja.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xasepezulinawatoxosam.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10544668610.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/kepumifigodonibuwibofiwiw.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/36658148830.pdf
    • http://av72-reklama.ru/userfiles/file/1630954115860dd6718de5eaae697b.pdf
    • http://w-f-l.de/user_img/file/20447294992.pdf
    • https://clubslotalmatriche.com/calcas/file/vovivusu.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_off0000d9b5.bin
36a3afb5ed72691b0129c9c5fe5dc660d365350ef7f5dbb73c11d2333ec00ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16140 bytes
font_01_sfnt_off00010370.bin
703dbd845da2a522fdb96afcc0bbfe1d43c10dff630d7bd976f9bced07840bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11116 bytes
font_02_sfnt_off00011ce2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes

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