Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f94b02eda73efa7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 12:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5edb8c98f6c4b2482697d3d4f7dc0c86 SHA-1: e2c46c2dbeea766ecabe5ad05e98527e11a91659 SHA-256: 7f94b02eda73efa768bac1afb8e6ad3990992694d8893a2839392e8b5a12ffd1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic flagging a link to an algorithmically-generated URL on a disposable domain. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosantanna.eu/userfiles/files/fefilakujifamobu.pdf
    • http://asesoriazabalburu.org/azaba/files/file/22509226716.pdf
    • https://repare-ton-smartphone.com/userfiles/file/13753766361.pdf
    • http://worldnaturalfood.com/image/upload/File/90074186358.pdf
    • https://siahotel.com/userfiles/files/66855636777.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905144909.pdf
    • https://shindah.com/images/ckeditor_img/files/36945564463.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b729061d6c157fb8e6470a8c7248f6c8/wuxawididiz.pdf
    • https://akproauto.net/nbloom/fckuploads/file/79818051013.pdf
    • http://tandartsindex.nl/images/uploads/nokebisaparizefiti.pdf
    • http://formpart.com/upload/ckfinder/files/73390780470.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b1e322eb---19182025148.pdf
    • http://methese.com/upload/files/67840720945.pdf
    • https://eqonetech.com/upload/userfiles/files/depijowetovitezedafipule.pdf
    • http://ingegneriarossi.it/userfiles/files/46937069978.pdf
    • http://uekekb.ru/!upload/files/62781764109.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_86B6BC30EE58C6BD.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/zagelazanonokapufaxup.pdf
    • http://dailycan.com/userfiles/files/4240425885.pdf
    • https://mgs-on-track.com/uploads/misc/files/bekunurowo.pdf
    • http://westernmaki.com/uploads/files/xijafepinobobifalavepu.pdf
    • https://fitness-sport.it/userfiles/file/godarefo.pdf
    • http://cauthangdep24h.com/upload/files/bijoxotutibegototami.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=brooklyn+nine+nine+date
    • 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_off0000d979.bin
cb7cc5147cb94772249803e615f8151187ca622f546508df0ab03e7624165714		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 17664 bytes
font_01_sfnt_off0001077c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes
font_02_sfnt_off00011f93.bin
7f5538a43d12ed250aa772cea5f4654ae204025580dab9fc0827b74987e65925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10332 bytes

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