Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf081113c85864e9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 13:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32a6e0c3d41bff648a50be54641dbb4b SHA-1: f329107124f9ce5d0f2b459fd68c3d2040f106fa SHA-256: cf081113c85864e90cd27cc0ed62e3340155a15c89f9c1ea692bad5eee5657b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=game+bishi+bashi+android
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/80002775950.pdf
    • http://yishiweb.com/upfiles/files/20210908_091830.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135daadb44fa---zomubo.pdf
    • https://cordovajewelry.com/images/file/91943737410.pdf
    • https://granitnet.hu/editor_up/85083246791.pdf
    • http://sydjpg.com/images/upload/file/20210908_075325_101.pdf
    • http://dinobajka.pl/Upload/file/tomanuwelirab.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/zikuxemisuziwunin.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_202337.pdf
    • http://mlead.net/images/e/file/72227297678.pdf
    • https://tdfstore.it/file/wizifewug.pdf
    • https://lochoanggia.com/upload/files/65763417437.pdf
    • https://facades-et-traditions.com/actualites/file/74001243517.pdf
    • https://10glazsikeyrosa.ru/file/ninoju.pdf
    • http://agataklimowska.pl/userfiles/file/43296899642.pdf
    • http://elfobchod.cz/foto/Image/file/xubakavifiduvuroviwoz.pdf
    • http://f1-rennsimulatoren.de/userfiles/file/jevusuresenijarisogofa.pdf
    • http://studiolorenzoni.eu/userfiles/files/davevupumidemokini.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/22163335710.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/68198282929.pdf
    • http://juentai.com/userfiles/files/11498055031.pdf
    • http://nabisori.com/userfiles/file/2670955298.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e82a8fbaabdbe96b2cad6fb71036863/wowavu.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/89796961287.pdf
    • https://artenika.pl/fck/file/tojedonubigoladorawa.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_off0000c4fd.bin
543b817a480d7a03f3d693c66b77d641514a17bde60aa84a7b96f4ec695a0560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 22848 bytes
font_01_sfnt_off00010085.bin
452ec07a656dfbcad0b935067b974197a3620ee3a9e87d7104a593bc97ea1d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 10548 bytes
font_02_sfnt_off00011853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes

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