Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a741f7c45fb8838…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 07:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b07074cdc14ed11c42bf18298103a036 SHA-1: 11c2529b818e1876d223d7a7afe03a68b2b20ef1 SHA-256: 7a741f7c45fb8838197cf59a2c432d2a3219a28da1a8d1db51e34498dc094756
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a network of links designed to obscure the true destination, likely a phishing or malware distribution site. The embedded JavaScript is likely used to redirect the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bivew.pdf In PDF document text
    • https://sukhayurveda.in/userfiles/file/kudakejefagiweg.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/baravodufijujisamotu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/xosilikisuxibariwid.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/nawevofuf.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/81308432926.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24167528b---98003095239.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/40509966886.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/27281926026.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dabawozumowekav.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/15966223489.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zipatotubazofoxikep.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/94559292379.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/758599940.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/57698782221.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/31823925834.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210914060428.pdfIn PDF document text
    • http://mlead.net/images/e/file/3142314744.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/9447656603.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gezujoxel.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5e1af89a73dd5539712e8973706c2149/poxavuzimigibukuzadamatax.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/danipisewen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+studio+vsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 18060 bytes
SHA-256: a50fcec001237ee1f522d78068d33568fc2fe291c5817be453162ad9985642a1
font_01_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10048 bytes
SHA-256: da98352373515c143a0cf7ad1027f1488f2146b0367a4646db8f8cc028422003
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1