Malicious PDF — malware analysis report

Static analysis result for SHA-256 b960503708cf33cf…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 10:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 834f48493bd1eba0f2b7c1a88f058cf0 SHA-1: cb6bc086dce7d124764b96b3ab0040390d485641 SHA-256: b960503708cf33cf4b6978524e72b22ae95ae1ed97fb1b4320eefaa22ff7e2da
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. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm, and numerous URLs were extracted, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://subarini.ro/mm/file/63939962486.pdf In PDF document text
    • http://studioambienteterritorio.it/userfiles/files/12458386769.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/97513916706.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/10622920505.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/8810261212.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/mejefuf.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4926682622.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/xedemizagowemapo.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/rijuzizapovuribodu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5814a96cb---waxepeleb.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/86564740543.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/56354523329.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/tefirarasaworelixef.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/donamegizotufolif.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/kojotajufax.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/84845101336.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33393587964.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210912054936.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/teluba.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210905202458.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74983409552.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-11/20210911142210198308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mafia+2+mod+apkPDF 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_off0000c3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 20880 bytes
SHA-256: d6845028d381d776d6fd266612bcba39500be3b233df65bf183db093adbfec06
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10216 bytes
SHA-256: c2188da370786a133734168d898d50c92460bdf42302eb984488f0ef705648b8

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