Malicious PDF — malware analysis report

Static analysis result for SHA-256 2000bc55a9cb83ca…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 07:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f04d4d4832b6d34ee8b42633ba6997c SHA-1: f58bad66358cd043e17bb1407863f6bb79d65df0 SHA-256: 2000bc55a9cb83ca4cba6dfd9dac89cbe9912c557aa5b4dba45891cdd5e9db69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://tugrabilgisayar.net/resimler/files/latopedibolivap.pdf In PDF document text
    • https://agape4u.org/userfiles/file/84859396656.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18063c41e---14401255789.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/35670656898.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuxomozizez.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gerofevin.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/warunaxatu.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/80258754340.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tegugo.pdfIn PDF document text
    • http://erpos.sk/data/files/73842597984.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/21320974447.pdfIn PDF document text
    • https://phm.vn/upload/files/5492787110.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/navobinosatufaxidowu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/94925191550.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/nusezojudikiwupu.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/forifojediwujatabapuxepi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/libixikewubilejewef.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_D2E5B286D7773D8B.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92682589621.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f91fcb3f40676d6c7b685def59f022d/guvevosatukupufelofow.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dazesudozegujirat.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34243267261.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/56728033787.pdfIn PDF document text
    • http://htygroup.com/upload/files/tejipevini.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/83765281555.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/6613023406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+generation+0PDF 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_off0000c21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10452 bytes
SHA-256: e2f01bd1c73e8f7ec155b0b8d380b46799ded812a1cb2002cc1cd561cfdf4e48
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 17736 bytes
SHA-256: f5f5e3851d4498e4c8b1c995083371ff9553f7e3916e7d8b53c6b6c9c5367e94