Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37f2413f44db365…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 20:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a61f1d84a75e6a71b912f3aeeaa0ed7 SHA-1: f591a6290f20149a302bf2a41052163ce961806c SHA-256: e37f2413f44db365e71202e7133eed5f9a813fbfc763448e40450798c9e556ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=grand+theft+auto+3+ps4+cheats PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/19f91038722f3909c4d357e2737ee493/xukudefakipupos.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/dafujopawaberezumotowug.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/xubiluwadavivagite.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902201400.pdfIn PDF document text
    • http://toonesk.com/upload/61092681226.pdfIn PDF document text
    • http://lyshiying.com/d/files/57762066901.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145948074536---movimiwen.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/48926960236.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kixevisosegasenomiganu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/48017943030.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210919181659.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/bogojopabilironagiferemu.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/4858348309.pdfIn PDF document text
    • https://motecx.com/images/file/38334211194.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/24550609303.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/moziwugijatonuvaw.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/30192600335.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/madiwokuduvuwegoxamirir.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/48714070334.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/93573492834.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/jolitamowipag.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/waborigogogegijafese.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109040727261014.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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 10968 bytes
SHA-256: 7a5b56e08d464d2d418d25cc125980d789e4e396f668a012b8e8b2b4fadef92a
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 15000 bytes
SHA-256: df5ec0386a4c00858c1fab4848288791b2c4e5730168b6c2631cbc0fe9a163ea

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