Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b125f274842538…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 16:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a678cd1a449cb9faf3cf54119e72b977 SHA-1: 9e6214f7f02eff3dfe1e54fb4791b5e51f28e7c4 SHA-256: a5b125f2748425384dee6303d25ed0d5aedf28c7bd9eb043e48cc329cbd5be8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm strategy, reinforcing the phishing or distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://oniceh.ru/uplcv?utm_term=dungeon+%26+hunter+legendary+archer+pixel+idle+rpg+mod+apk PDF link annotation
    • http://www.jfac.kr/ckfinder/userfiles/files/kibavirusa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/43447506976.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/feruzolisexuninekuvuve.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xilok.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wawepemajalom.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/bositopegijiz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3963871f07d94a87d062c11655b718d2/xarebakipesisimugum.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/1142822217.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/sesuwiduwekofonitar.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613261304d194---poxaxomave.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/60127000580.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/97053991575.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/32683339197.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/56351546349.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/8600562795.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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 9712 bytes
SHA-256: 5a85c10793c7e23415dc523dc75a69503c0c16309eac20ed0aaf5404ac6525bb
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 24492 bytes
SHA-256: c5de67321151ce93f480559043cfbdb58f0985abc72da432c08f6eff87bac122

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