Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db52fff5883092e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 03:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27c76827bb2ad22444c7638817e11739 SHA-1: 3c4ff2c84fc1618947f730559ebe647239787c38 SHA-256: 9db52fff5883092ec8f9100fa35321ff80e1aea4aa3179b2124cad57f3b104cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=cheat+untuk+game+android PDF link annotation
    • https://amoslodge10.org/ckfinder/userfiles/files/80109769583.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/megusozafijafomulifuneve.pdfIn PDF document text
    • http://aimic.com/userfiles/file/90070957899.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/87738948990.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/948388259.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/3101044279.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/karalaxu.pdfIn PDF document text
    • https://mangallagn.com/images/file/16962894237.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bawexamupob.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kazetexu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/2415814968.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/pelixepavawanemesepozevep.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/577907368.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdfIn PDF document text
    • http://sswjeans.com/files/47853119342.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/45150008761.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5252a763---kuxagigetaxebemebife.pdfIn PDF document text
    • http://retailcop.ca/files/33013373162.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/lusobogiposunegeluge.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kigemala.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109072232175880.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0460cc0---98173581939.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/divizesefizasofisu.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/96358425412.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_off0000c40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 10704 bytes
SHA-256: 3f4da8ab58d8e6c0cb94c935519a19fb6dd5c472c018975a16f9ba7bf3b4ed59
font_02_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 17748 bytes
SHA-256: af252d51e2d966d2def024bfe5736c6b7c276949554f56369361d2a9545b5b3c