Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a5445a970d3297…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 14:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae22017f07b30d8bcfa774b6fa901479 SHA-1: a9cb73d8132a5cae7fae83d1f8c5f5c76cad59d7 SHA-256: 41a5445a970d329775f9240db518bdf6ac7114c49946ac9858d4e25c18b93de1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to external domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these URLs are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=got+me+acting+up PDF link annotation
    • http://connect-event.fr/ckfinder/userfiles/files/14233368905.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/72988739098.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/nufotiwigoke.pdfIn PDF document text
    • http://feminella.ro/upload/fck/zerokifajaru.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/xuwitadububel.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/wonamirata.pdfIn PDF document text
    • http://livestocktool.com/d/files/puvujezuperadusirupibebib.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/gozobok.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/46431178083.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/10199775985.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/salegoj.pdfIn PDF document text
    • http://519pf.com/userfiles/files/motiwututagulosa.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/vupenogazux.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/64928122352.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/vapetixa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161586c76d2147---91709142221.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/39749967124.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/407e2d97d315587ac0c33baa11fad868/44939287756.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/97983714345.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/nijolipi.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/lowubisuzaratugivozasak.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/89406653496.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/foranidav.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/97094425825.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 10544 bytes
SHA-256: 133ccb0d70d634764f27bf5f03666cada94747d0caa9edf5e7abb166cb2fead6
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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