Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1376bcd81dce636…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 00:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56ee63e4efa92284ba1c9b071da7857a SHA-1: 5c5bc743607bed997ab1226d7bfc2f90cc1d2261 SHA-256: a1376bcd81dce636902ae5e52e12acfc68df42f71aeae3a3ee91043d96c3f11e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document is designed to redirect users to other potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://otelm4b.ru/admin/ckfinder/userfiles/files/31465493911.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30b25ea149d8e7add14c9f1059cb7334/kupafawiwoz.pdf
    • http://gaziogluenerji.com/images_upload/files/bunozutojoxizunakete.pdf
    • http://kossuthdigisuli.hu/userfiles/file/58841181197.pdf
    • https://biothiennam.com/media/ftp/file/zusaxiw.pdf
    • http://vijyaiprismcrm.com/userfiles/files/nizijiremir.pdf
    • http://studioaba.net/userfiles/files/45373695647.pdf
    • http://cssh.es/img/file/zumusorimulojef.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/39300455720.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/wisovebugubebudetajumuvi.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bca48b48e---53582797047.pdf
    • http://akinmedical.com/uploads/file/86729040872.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/ravulipafox.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50817278114.pdf
    • https://sangolongphuong.vn/longphuong/news/files/53099594480.pdf
    • http://hublihorse.com/uploads/userfiles/files/labupakaxesawonawuduf.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/24847039883.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nijoruwopuwo.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/risewolabakovaziwa.pdf
    • http://safedoorsystems.com/cmsimages/file/62907400047.pdf
    • https://hosvagyok.hu/userfiles/file/bamasawewawuzufejo.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/rukaroledexupik.pdf
    • http://markasib.ru/ckfinder/userfiles/files/65748073806.pdf
    • http://oecschool.com/userfiles/file/33948069016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+good+will+hunting+online+free+putlockers
    • 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_off0000d944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 16792 bytes
font_01_sfnt_off0000f15b.bin
c85caa5f84e8445d27705f927a0fecc6117cceda0ccdf9fecbb6f3cdc8493ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 11168 bytes
font_02_sfnt_off00010b4c.bin
a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17844 bytes

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