Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8633a9b27a2e3b7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 20:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17e424b2e9ec5cd957503623425a998f SHA-1: 94ba4d2cf73d7ae77d02f1db01fcd4231c4e5ab3 SHA-256: a8633a9b27a2e3b7b4de6185a261a0ba1d2d23a628905f51c6c3477cec125815
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixel-pro.ru/upload/file/66867557496.pdf In PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/53358794676.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bitov.pdfIn PDF document text
    • http://gro-felix.si/uploads/nizivosaregotasigu.pdfIn PDF document text
    • http://planbmedia.hu/files/luvasanunumojelomunenaxo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315a75072df---74654880592.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/25047377974.pdfIn PDF document text
    • https://majubesar.org/contents/files/gagotibazolowawilixekali.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19410878050.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/migopimovonuwifidapeli.pdfIn PDF document text
    • http://gapp.fr/medias/files/78205337865.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/felesifanisulipurijiwo.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/bajadinixujokofomapafos.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/bopuleloroxesezun.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a287244826---xewuxovefegobedila.pdfIn PDF document text
    • https://ptogel1.com/contents/files/88290058087.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fatesasabegeburadofebeke.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/siwumivo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/14073750808.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/21491967151.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/46912835948.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rewiwikuwababid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+martian+sends+a+postcard+homePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 10716 bytes
SHA-256: 132e7c8d8e955f01adf99fe088c838a32756dfc2a34a11094f6910393b9381bf
font_02_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 18208 bytes
SHA-256: 76acd3025c807cf02002d9cee1dfec8761ec1867e9cd86f1f30ca3f867d31f22

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