Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8abbfd748ab10f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 04:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 483b17ad1a4360cf099e8ef59ce365d6 SHA-1: 353b30afb7c625afca5c4a821c27b9a34cc7920a SHA-256: ec8abbfd748ab10f44ea1c188414ef82fc8f36c33a177ce13b193dbd93bf5e3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver a malicious payload or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=top+eleven+2021+be+a+soccer+manager
    • http://wohntraumgmbh.at/1047845003.pdf
    • https://aakritidigitals.com/userfiles/files/bolidelobudovezozidexe.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/korudadifevul.pdf
    • https://insolite.lu/img/userfiles/files/gexokedozirep.pdf
    • http://www.jindatunnel.com/up_files/file/wudukasafu.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab889d111---motujipevuxibowiger.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/genewax.pdf
    • http://mijinmotor.com/fckeditor/userfiles/file/febogekezaxi.pdf
    • http://struttur-arch.it/userfiles/files/83609680957.pdf
    • http://mfcpavpos.ru/file/53648985742.pdf
    • http://salman-is.com/userfiles/file/19275414608.pdf
    • https://jokerprod.net/userfiles/file/50682524490.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902233756881375.pdf
    • https://testagenda1.myagenda.cz/pictures/editor/files/fokipumuxe.pdf
    • https://honghow.com/ckfinder/userfiles/files/66605005560.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa8d59387---wasobuvuku.pdf
    • https://asiantms.com/ckfinder/userfiles/files/xexalakozikosedewogole.pdf
    • http://agcslohian.com/userfiles/file/76378664027.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1885902174.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/13434421895.pdf
    • http://usa-ex.com/images/blog/file/pikazizozemomomumuputo.pdf
    • 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_off0000e121.bin
846e30c653ed40569621e9a5b63e9d453d1ce17651ba6f3bd7943523f6cbe9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 10988 bytes
font_01_sfnt_off0000fa90.bin
dcd660699bd68ffe9d25b76f8ae69d257c62879ae5d55ce04a56170b0df2ebce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 18020 bytes
font_02_sfnt_off0001290b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes

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