Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0c435d183bfeb6…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 14:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2254dbf6d2678d9a531c86667ec19b18 SHA-1: c75f63801cf9956e3a7330d44956a866d27e8012 SHA-256: bd0c435d183bfeb6b98a0dd0801561824145093c5e86f428d52449f451f256ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on unknown domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://horacebatten.com/ckfinder/userfiles/files/29171733823.pdf In PDF document text
    • http://spharma.ua/files/file/59809743585.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nugeze.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/titaxab.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/jepivomolinanodaxi.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/45299451392.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/38510642432.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/femibuzesaxajisuru.pdfIn PDF document text
    • http://rongqichem.com/upload/files/kalakatigowajoxuwe.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/34066724401.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/31412840377.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/wekagedukevapavebad.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161316a31160da---3089935105.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zodatigob.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/14302122440.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/zexamadinejolujibet.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mozodivokuwatosematixomev.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/68163057902.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/nivobenoxejudabemupiwuwip.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/belajodagakirav.pdfIn PDF document text
    • https://somogyplusz.hu/files/nematu.pdfIn PDF document text
    • https://nexusmediation.nl/files/91633647146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=back+to+the+future+apkPDF 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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 18060 bytes
SHA-256: 3445762f964a4f5a7b0159c62c8b624ebd0df8b0102942ba67794993e3c210c0
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 10412 bytes
SHA-256: 449e0d078c99024db84633b5824eff12a075341b9938a3b4dcd3e2777a1f56a4

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