Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ef6f253fe7ad3f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 06:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6690c3beffcc99627a114590dd42ca29 SHA-1: 9c1140d9255e0a0871d58384b309c6b1743ef666 SHA-256: 73ef6f253fe7ad3f41176146abcb573cff743e81344effbdc7f5af73190fa279
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://fceresources.com/ckfinder/userfiles/files/9229382744.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/15936701566.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/zetarisawotupujig.pdf
    • https://mandarinkinesiska.com/userfiles/file/50428752699.pdf
    • http://chongthamphucthang.com/images/news/files/88362638545.pdf
    • http://donghozibistore.com/luutru/files/10504853361.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fegijagunuwenirivovanumi.pdf
    • https://eqonetech.com/upload/userfiles/files/20232842932.pdf
    • https://promise-land.com/upload/file/loluzaxexono.pdf
    • https://mauspro.net/upload/files/tasunuridage.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/69850440278.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/43659510207.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repofipamuxev.pdf
    • http://besteva.com/upload/files/58902876208.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fejovinoleve.pdf
    • http://identik.hu/editor_up/76531621804.pdf
    • http://vitcongiong.com/uploads/files/vewanedozevoriwibe.pdf
    • http://bebaldebaran.eu/userfiles/files/66448138870.pdf
    • http://nandishoverseas.com/UserFiles/File/samotedixalakupub.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3a284f55---42895264858.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/gusanemupis.pdf
    • http://cascad-trans.ru/files/26548404280.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+watch+a+movie+with+friends+on+messenger
    • 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_off0000f633.bin
8102a19e83cf2b4679030e0ad139db11963261b395d6278bd629d0e9705a8c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 11020 bytes
font_01_sfnt_off00010f7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 16792 bytes
font_02_sfnt_off0001278f.bin
cc09edf820e04bbda4e7c41925ebc67c38cefc80b58395c5029731f1f317c407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 17596 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.