Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d143707fc434514…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 07:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7d28c185cacd29c11699dd17c6a6408 SHA-1: d7d4e8ef6999c1520f0f3eb74f5b01c5d47f3843 SHA-256: 0d143707fc434514bb7a12a9b8584f5464a68a4c21902a5dee4107c8b6aefc85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a high-confidence score. It contains embedded JavaScript, a common technique for executing malicious actions within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing content, suggesting an attempt to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://activsport.ro/userfiles/file/kabugijesizi.pdf
    • http://mapect.com/upload/fckeditor/file/98415184206.pdf
    • http://sincaremedicaltour.com/js/upload/putamudezu.pdf
    • http://clinical-pain.com/pds/userfiles/files/vowogudem.pdf
    • http://erictex.com/ufiles/files/dosexorefe.pdf
    • http://exhibitionchannel.com/upload/22178333770.pdf
    • https://tlkingatlan.hu/kepek/other/file/mukijekamunuxedawubofugi.pdf
    • http://galenbio.com/images/upload/file/67632336610.pdf
    • http://sintellect.ru/Repository/file/38727813843.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdf
    • http://escuelasfutbol8.com/docs/files/75544501247.pdf
    • https://adrfarysz.pl/userfiles/file/pujizazomokumofetanef.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fuwavevivomolire.pdf
    • http://folientastaturen.pl/_data/file/61726434588.pdf
    • http://pp-aqua.com/userfiles/files/65578259806.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/71339540294.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/219db8bbf99e73b31f6f0c6b0da845cb/69793301833.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/97378293113.pdf
    • http://abwingsva.com/uploads/files/25531585831.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/60079312798.pdf
    • https://morethancars.eu/uploads/edytor/file/44304753564.pdf
    • http://surestegc.org/documentos/file/13593580848.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xubav.pdf
    • https://ctners.com/ckfinder/userfiles/files/95142441067.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+ui+tutorial+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_off0000da37.bin
508429e2d95c3381b2199a3c8eadf8cfd4ebff6d5a08b977ee2300c2a8fb995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10272 bytes
font_01_sfnt_off0000f163.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
font_02_sfnt_off00010975.bin
db432a4d5c2b65b4e7c5ea34943a0a901d013b657fc0cad3b676d7183771ced7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 17748 bytes

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