Malicious PDF — malware analysis report

Static analysis result for SHA-256 2319a0f225e99104…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 20:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44fe21e46c54f3fd272f2fddf46d45d4 SHA-1: cb9a1e4f2e358d7bb1f643b7570c575c96a414b3 SHA-256: 2319a0f225e9910403d2ecbaf2a0b783e4636c52a2eee8e3e5b102051d72ab31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=want+to+exercises+pdf PDF link annotation
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15797403512.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903000709.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vilevesofokomiza.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gatugijavulufobedotovadi.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/49688924547.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/1152180595.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/nefilumero.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/68714736965.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/kanigipareraxize.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/6844601136.pdfIn PDF document text
    • https://virker-ikke.dk/files/89892859412.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbcc24e2f---bujuwemaxuwar.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/29363887243.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dezibawedowatoxejudako.pdfIn PDF document text
    • https://apra.pl/files/file/nilokakinekagopeg.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/leruwavenixiko.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/93655556782.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/39554642797.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161333e6d6563d---12735167334.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/wifubalovipefanezonozav.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/84918549360.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/pozediwone.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/dufefibajoroze.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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10664 bytes
SHA-256: 40609d042cbef68effa80dccc7a8e49d32dfc193201de0681b02c21938f48362
font_02_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16228 bytes
SHA-256: bbc97b9ac9b782160fb1788e05550ee33895ebc2fdd51793b0107ee51075e129

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