Malicious PDF — malware analysis report

Static analysis result for SHA-256 640764849845a6d6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 00:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b77080610ec8e85ca55d6895fd71143 SHA-1: d47c7d43431ef7677e6e054a5744e10ffb1e4c1b SHA-256: 640764849845a6d6c0af658f6e81292bb744cf33744e35561a2728ed0482e4dd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to disposable domains, and is identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using a large number of distinct hosts and UTM parameters. The presence of these characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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 http://arabic.cz/ckfinder/userfiles/files/52799903342.pdf In PDF document text
    • https://needlugs.com/userfiles/files/popotud.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ronebusevutovove.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020658091161.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7e23d289---xowawowibeg.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/guwuribigevipi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/venumudepixotoxuxogemi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b66c9d176752d6fe01f2cb3be85aa666/xituditovijokolelamak.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210906093855.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91553022310.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/39771925358.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/21845567920.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/44539322909.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/32909334941.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68648182786.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/bawegalijesekimumuwegep.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/16333834439.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/jafawalatuxonepevirase.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/paganejajibiralidop.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/50738527658.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/11050529285.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/bevataguximurufujaluku.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdfIn PDF document text
    • http://skncn.com/u/files/pulefixuni.pdfIn PDF document text
    • http://momsystem.ru/public/file/dugosebopimuwejawukosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hd+videoder+downloadPDF 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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 10116 bytes
SHA-256: f0e1891855becc70fbd52f70a2d7fe69c9c5bc65c0c0f4a90bfcf879df920c31
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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