Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a8ae156e351ffe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 01:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a32fbceb8192aafb21088b6fd32ac81 SHA-1: 146ab555bdf4a60b492fa69dd24061bd73c1a0f2 SHA-256: e4a8ae156e351ffe578ec7ed223e78874cd3f4b7078ddee0c338db87aa7b0bd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inmaabiladi.com/userfiles/files/getamokaxijizokoka.pdf
    • https://charming-dc.com/uploads/files/202109062105549910.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/nexikefe.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/vawolaxadikodove.pdf
    • http://gndpta.eu/news_objects/files/50243390739.pdf
    • http://qdjshg.com/files/file/nofijixuretosap.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e64d089---33765337316.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/dekufuritekalawakef.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a99481df7---29557559880.pdf
    • http://st-communications.com/ckfinder/userfiles/files/35272038058.pdf
    • http://incomingmakedonia.com/files/files/watefoxudef.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/dipajutazaniba.pdf
    • http://vina2002.com/uploads/files/vixojofoji.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/kamirinuzudizovoxe.pdf
    • http://a1-automotivegroup.com/upload/files/jopedazopabavurutatajo.pdf
    • https://chingchia.com/uploads/files/202109112323201786.pdf
    • http://inruho.ru/ckfinder/userfiles/files/54719353130.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/98027835141.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/41814247332.pdf
    • https://299-45.com/CKEdit/upload/files/28567817751.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/65916059957.pdf
    • https://kominove-centrum.cz/media/files/file/74720859304.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nordvpn+android+app
    • 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_off0000e4ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16792 bytes
font_01_sfnt_off0000fcd0.bin
e0c6ce064aa61612507fbf53f210159a99c69c9755487b57f3217f270443398a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 9984 bytes
font_02_sfnt_off000112f1.bin
01aeee1481a89e027468037a0e94ef993481b84e57055805ca29e0486291917c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 17024 bytes

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