Malicious PDF — malware analysis report

Static analysis result for SHA-256 434d0bb0e5d6918b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 12:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b74263407675e49ef3f3279a67b34c7 SHA-1: aa8efbf09b055c612b44b8f5ce2db5e994bd9ead SHA-256: 434d0bb0e5d6918b5dc02d7a7670c1cb2bc5ef17984cb772153427aa03b140b0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 4

  • 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
  • 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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef8829db9---44510864672.pdf In PDF document text
    • http://l-max.ru/userfiles/file/50739705356.pdfIn PDF document text
    • http://twilaw.com/files/files/8881756355.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/72126061156.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gubinowewetemut.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feee4edb5e---rusozutinopuvizijiwu.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/zemabejufofakezoz.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wurasagokit.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/rerowemasalelugizif.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nosavubopepikodolomi.pdfIn PDF document text
    • http://hoachattn.com/image/files/80860311956.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_5255D594F5ABF3D8.pdfIn PDF document text
    • https://afayl.com/userfiles/file/velegevup.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/sevotezav.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/merogiruzu.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/8087817741.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/54970450674.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/medorovinimawogawuzubomo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/6913880595.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/siroz.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/22699888137.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/sorikekuridiporu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/27527747587.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/81674953690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+apps+from+play+store+in+windows+10PDF link annotation
    • 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 11024 bytes
SHA-256: a08302e18c5904f39eb0321d176c807248c1afef5102b32ee18376ed724d8980
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1