Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e74a0231e2f935…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3891ba2a3e5ccc5f2ba41a0bf8f14fcc SHA-1: c6912a861ded1a8ddda25ff7b66da60d70ad1c75 SHA-256: 62e74a0231e2f93536a83a415dc5e12929763f1d533419186946cdb5e85eb6b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, and the PDF structure suggests it's acting as a link farm. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://tatishev.ru/admin/ckfinder/userfiles/files/geduvabofejalogoj.pdf In PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/vivagopagalizox.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/lopotewa.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/76982293474.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/49789440417.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/99134960552.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/taxujo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/66478589595.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/21727627382.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16142a507546d9---50175506806.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zubutodixusupiliv.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f133e35ef4---9846087361.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/78926834600.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/fotiwip.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/vilumunitugebi.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/5760562495.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zojojobalagel.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/88930332082.pdfIn PDF document text
    • http://stroi-sistema.ru/img/rogimipevaxukukevotavotu.pdfIn PDF document text
    • https://isosklo.cz/uploads/lewakexowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sniper+3d+diamondPDF 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_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 10488 bytes
SHA-256: df06424e63a3088c183f9346727446de812e27df1a3b1362ef447f13ad448485
font_01_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 17352 bytes
SHA-256: 6b1829a96f7eb3d8a7e72693fd968d9b1885c8d0ef558c54cd078b3a242f6e30
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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