Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03b3f4c53e841e6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 22:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1190c56569c9ff39f6375d6d452183e SHA-1: 29f7a40efbc2aa7ee755ecd86bf5b01456a6e55e SHA-256: a03b3f4c53e841e6cee9a50b165d9401807c3c6f9dbfbee208db23bf88cf3842
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these embedded links. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=free+wifi+analyzer PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/zavajes.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/29616339362.pdfIn PDF document text
    • http://gosapahostel.com/userfiles/file/33840756222.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/30929812723.pdfIn PDF document text
    • https://digicpictures.com/downloads/vizijamekegabonijuvuvutid.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/solamitasevegu.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/15283969943.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/tewuzuwazisozorebidosop.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/sujukukilapagubenem.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/15886906806.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49384418296.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/fozipobigesivuno.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/dosonu.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/retefuvifitaxomavo.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/sopewixexisamuvodene.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c898c8c608537943c80ae4ef4534e6a/77633797448.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147dda2c2087---kobazikovu.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/45798399865.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/senoburobuforafaxi.pdfIn PDF document text
    • http://pedraferro.com/files/files/vukatawuwudizirufikirojew.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wibusesurokiparunu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/16893454301.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/20424227075.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/gazev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 14792 bytes
SHA-256: 6bc5929eeaf146581e4295588592ae1dfb0fe55ca8376cfbdadaf71324070776
font_02_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10056 bytes
SHA-256: fd252373599b8f94b8525da6d0ddc12f4cdf84788257af61b0c63cfe563ce459