Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7931010cfbdcdf…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 23:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cac908e3365429e9826b7ff1094016d SHA-1: 3d760427cc42a462b73594d9ef7291457f3ab9a3 SHA-256: 5b7931010cfbdcdf55f97ab26e47d0b090a7c7e635f08793a1ffccc16d8dcc0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, 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 URL patterns suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://abdon.madteam.net/ckfinder/userfiles/files/gigulogeg.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/41988361957.pdf
    • http://stellamaris.cz/userfiles/80176134496.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/85233802279.pdf
    • http://ipceurope.com/assets/file/vedelatebabemur.pdf
    • https://casabresciani.it/uploads/file/3216320832.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/98572998954.pdf
    • http://denis-lefebvre-services.com/fichiers/file/33000969575.pdf
    • http://nhactheducthammy.com/upload/files/jimesasowigazakeb.pdf
    • http://naturallabs.de/userfiles/file/25871953247.pdf
    • https://plentis.eu/ckfinder/userfiles/files/48421089062.pdf
    • https://estoniapools.com/contents/files/tegabilopinapajowefuvezis.pdf
    • http://noahmission.org/dataroom/file/63508829979.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/54099221220.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d497d5eca---76055007140.pdf
    • http://bolt-go77.com/fckeditor/userfiles/file/besabijarifejib.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613342af682ba---9398306575.pdf
    • http://nuraski.pl/wsg/userfiles/17068168145.pdf
    • http://www.fashiongale.ro/userfiles/files/20877834478.pdf
    • http://ciccioinpentola.com/userfiles/files/redifinanowifoxi.pdf
    • http://nuk-amro.de/userfiles/file/54848342451.pdf
    • https://pierreseche.fr/userfiles/file/wasenizojofedinozu.pdf
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdf
    • https://taucaotoccatba.vn/images/news/files/58892794705.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+see+who+views+your+instagram+post
    • 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_off0000b3ca.bin
a862f5d83aad57103641a2c1a1ea9280d42cb19948dced759608fc0c85e332c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 11048 bytes
font_01_sfnt_off0000cd7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16792 bytes
font_02_sfnt_off0000e58d.bin
c1851653848fe8f41fd1c0181e0a5b2a56f7d866f91312c64358267c796528d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 17380 bytes

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