Malicious PDF — malware analysis report

Static analysis result for SHA-256 124e26138dfb946a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 23:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0eba3d8ce50b2a6a96259cabf3500fec SHA-1: 33fa415c0e970a1b2be47b1f916022a15a799155 SHA-256: 124e26138dfb946a91e9d6bf94e17e2f0c4f1859b1d2d97d022a04138acf4789
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://decoworld.in/dayafter/uploadimages/newsimages/file/kisenivumezozikeganefuta.pdf In PDF document text
    • http://mywymc.com/userfiles/file/gopumaxuxugigunu.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kezevumovisalupiwataj.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/8715812000.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/16479102874.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/biridotidemexerax.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/75263207847.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/45314107609.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/texofegijapixadigipejogo.pdfIn PDF document text
    • https://servauto.fr/img/user/file/81047354314.pdfIn PDF document text
    • http://aven.su/userfiles/file/doxorejojiduwuxise.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/35654765380.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lajisaga.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/tavekejifuredokonotipe.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/4517247110.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/kusakupiziwen.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/baligapagumokax.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/93563437688.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/joxodedox.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135de80be2e1---35265048317.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/28357672751.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6f27f2b8d014df57f3c255acd66e8715/27614327111.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/95685282684.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/biwanojenemojamelopote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+windows+media+player+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10744 bytes
SHA-256: 8ebf2fc73a5ef3a5b98cdb1a23477165d12f4e95d952079a53addaeb7de9699e
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 17292 bytes
SHA-256: 49e6a5873405b58f1c6a7b0619fff7212cdd734cfbf7ae6d350a4c384ef85ab2