Malicious PDF — malware analysis report

Static analysis result for SHA-256 51402f4f3f88731e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 06:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 116e22fa6df03966e034894aab572627 SHA-1: df62c930dfb907d43bf98d01cc0e19e2b0b3a1b9 SHA-256: 51402f4f3f88731e5cfea56c0c23121631076f9efa94045d764882a8f34904cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdf
    • https://www.confirmedtour.com/files/serosidutoram.pdf
    • http://jan-fotografie.nl/upload/files/tisidanadewox.pdf
    • http://gerastar.com/userfiles/file/padamumijezed.pdf
    • http://grupophi.es/uploads/files/vugofaj.pdf
    • https://dla-pracownika.pl/pliki_user/File/7000287805.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/34253734708.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/begefuvunisosolav.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/vuvutupupofufajo.pdf
    • https://arabadvertise.com/userfiles/files/gogatadiwit.pdf
    • http://brcassociati.com/userfiles/files/muzuvufid.pdf
    • http://cycling-software.com/files/file/35502039581.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/85300195730.pdf
    • http://hunting.kg/userfiles/file/73040852004.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143c96c8f06c---kibenijobiwiw.pdf
    • http://technology-mp.it/userfiles/files/juwikugoliz.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/56927096591.pdf
    • http://reginahajo.hu/_user/file/19897383319.pdf
    • http://hbaoge.com/upload/files/22623806813.pdf
    • http://salonmysliwskirys.pl/userfiles/file/80596902725.pdf
    • https://grupo-kayros.com/userfiles/file/21403125380.pdf
    • http://softtox.pl/new/userfiles/file/57917913094.pdf
    • https://thebottombillion.com/business_school/uploads/file/4801204307.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/mowufomoxolamunugikuzines.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+apps+weather+widget
    • 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_off0000d700.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 16792 bytes
font_01_sfnt_off0000ef17.bin
af6001fae46ae8f7e01e09bfdf79297dcde0accde353e95d05bb3691637f3dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 10692 bytes
font_02_sfnt_off00010771.bin
2611f2acd8827a3fc581adb3ada0892dbdba14bc88786e1436359295ce2a8f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 17396 bytes

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