Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b736c4eac8e7d0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 03:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d211d4e487316952c3748b7565bda8e SHA-1: d854501e642cdf84d357047ff891dad7e0470d34 SHA-256: 64b736c4eac8e7d08893e1fb8ce1eac80ec18cbd54873a20f27ad4686f8fc790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=puaada+movie+torrent PDF link annotation
    • http://ufcnagykanizsa.hu/userfiles/file/46589108524.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/14622798120.pdfIn PDF document text
    • https://go2germany.ru/files/file/gefujokudigemegafub.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/61020385776.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/65174318868.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/98421698496.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jipujinogewogadovizidab.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/tilekexulunewupo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/5084434482.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wuwozuda.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21059328631.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0302b9830---58786017141.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/jezuzogixejipujus.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/54665402986.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zakimigitisulizapumat.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soripijoxinu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gunojoso.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/49291968628.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa790239fd---71121304759.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/52260540718.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/94386087831.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/rakikapunabomerijesidob.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/xinuxamujuzatavulebade.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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 17720 bytes
SHA-256: f80e33d7939c4e9af918c67fdf281744638de89831a1590109da184531bd55c6
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 10364 bytes
SHA-256: 33f6fdaea46948b69f24fcee64e96ad120650800a8c732f9ffc77be4efc0e6f6

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