Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fdee343f630959…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 12:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79605ef0a06e3d0daaf83ec06b0a3d1c SHA-1: 02162003544f3e4ecc98a3b5cdcb896e2bf63c5f SHA-256: 56fdee343f6309599aa5281cbeb8dc2df41be06a0172db90e1e580f48ca9e645
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs are embedded, suggesting an attempt to redirect the user to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a large number of distinct hosts, indicating a coordinated effort for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161393b0066e82---11096066487.pdf In PDF document text
    • http://farashimirooz.com/files/96178604951.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/safimedurofudi.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/xazadijevaxe.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/duxutibikugot.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/70694349051.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/14896046814.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210909055335_560vj8.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/81683356929.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/58027315803.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/23334140002.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/wozofakimexozub.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/93142880966.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/kepadedaz.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/nivuvegetakotepumelojinaw.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/sowumekonanebumud.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sesugixidaferixaki.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/87511353888.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/wurumeripalo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/87281722325.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/10277979146.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/66680681428.pdfIn PDF document text
    • http://ux-school.ru/files/files/44442682817.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/ranapiboralin.pdfIn PDF document text
    • http://1careglobal.com/upload/files/kiraxoxijoreset.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109061501466692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=omegle+webcam+settings+androidPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 10964 bytes
SHA-256: c5674f5ce0c645c5b7b4f94d50ba1da8f66eeec3b4f2164d4e8f9bf7dd7404cf
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 17608 bytes
SHA-256: 79e6897ec5cc151239b881ac2bf288c8f8666b03799bb344d9fc63a334f26277
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1