Malicious PDF — malware analysis report

Static analysis result for SHA-256 9979bd6b8910a588…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 17:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 88f64dda9f8d0277bd807abeb776c636 SHA-1: eb5ca0351f6f3435996a9668bcbbceb4484fb8eb SHA-256: 9979bd6b8910a58857884b502171a7ac2f9b0995a4f7eca0cc9127611d561d5a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution, containing numerous links to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://aluminiosarla.com/userfiles_arla/files/sodefebakapojuv.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/rugisedi.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tonapijaf.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/2525557917.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/litanipomupobiza.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/97394311740.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xinuzakubolavepuzoj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409d64eaa34---99535022137.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/gadofejusekituvixipuluwur.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c352e3e2e---4209426737.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/kigoxizu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/2234897491.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/88400053157.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vodamurumolinofosetaligi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/tivobazifaw.pdfIn PDF document text
    • https://membermimpi.com/contents/files/23810222362.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/limonira.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/wubifamab.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/kiguxubefaz.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/29574119351.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/18165134230.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219111746312654.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/70837773386.pdfIn PDF document text
    • https://siroyensao.com/upload/files/futexidafogulumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gt+speed+club+drag+racing+mod+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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 14148 bytes
SHA-256: 7126da1bd8e4487325ead6d676d68ebc4f8d77e2e31061b714fd55c71886d905
font_01_sfnt_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 11228 bytes
SHA-256: b9354081e45b648b125c725f476e8cfc745d958dcbbdd2e08c0896fa9fc6011e
font_02_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1