Malicious PDF — malware analysis report

Static analysis result for SHA-256 b564736e91d76ad2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0230cff9504542251da8cad0c664132a SHA-1: 7bd9927a9557cebc2b8a8d20b4dec52e3c477792 SHA-256: b564736e91d76ad2c23cdd6906c49906fe80749ad6c30eff6ccd5bbbfe22645e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The presence of a link farm heuristic further indicates a malicious intent 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 http://hitecds.com/userfiles/file/wisivoma.pdf
    • https://egokituz.eus/files/galeria/files/97588028429.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/90439797140.pdf
    • https://mehreganimaging.ir/images/upload/files/71037707930.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobori.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60768675042.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/kepelugadukajerabuta.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/084d62c3fd636a96a2e6aa0808e3803f/4043893117.pdf
    • http://szerecsengyogyszertar.hu/editor_up/45158285975.pdf
    • http://rewitex.pl/userfiles/file/pududexujegilisewuxawib.pdf
    • http://zdrowejaja.com/Upload/file/sorejatisiwuxosogu.pdf
    • https://hse.tw/upload/file/55140648239.pdf
    • https://thaiwoodengames.com/files/upload/files/gojaveva.pdf
    • http://gabortech.com/admin/file/wezijuwev.pdf
    • https://mvmdigital.gr/files/files/77414431491.pdf
    • http://dywin.com/uploadfile/files/89491223613.pdf
    • https://melz-feu.ru/upload/fixile.pdf
    • http://baodieptailor.com/uploads/2021-09-20/images/files/bibilezexuwer.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/98789374982.pdf
    • http://hcbarrett.com/user_area/file/6332869510.pdf
    • https://hgindustrial.eu/userfiles/files/39509037014.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/wofiketazixemako.pdf
    • https://viadagio.be/userfiles/file/fefadusezupawuxani.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+stream+football+sites
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAC 16792 bytes
font_01_sfnt_off0000c5be.bin
df35018fbc3c1e9ab66585f0dd04f5fd73f1b6b76228dad32d5a8235e08745ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 14904 bytes
font_02_sfnt_off0000eb10.bin
f8e933ea1f55dab762858f1d83341903dfcd9ec04b62d0d8f080cdb3ae286a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10432 bytes

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