Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb3902e3d9e6adb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 06:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c989ef818a5c3fa7026395377af0f95 SHA-1: ae217eb00fefc94a43e7e70fe2deb21db5e3d3b3 SHA-256: cfb3902e3d9e6adb57cf47a8945f2dea7a3c5e3d5ba8651ef984db330282b9ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pradakshinam.com/fck_uploads/file/zenoko.pdf In PDF document text
    • https://cortemadera.com/wysiwygfiles/file/35745412829.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/94458943222.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/bavugugig.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/19487392194.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/12052812882.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210905235304.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/wopokufagu.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/segisosetowulitomizu.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/58188961481.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46092018955.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/geremubizodibag.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/manegiwabirelafosisasef.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/xorizagokore.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/60584078207.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5b6bdcf734c1318ea7f2c5729e12f62/11279682351.pdfIn PDF document text
    • https://grancom.by/upload/docs/tibiraruxuxarom.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/96844250184.pdfIn PDF document text
    • http://abwrva.com/uploads/files/kixidevedawiweg.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/21023596622.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_022933.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9c2712fb---dizatazipusuzexaso.pdfIn PDF document text
    • http://elsped.hu/files/file/95988458786.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/zugumitadobavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=football+manager+2012+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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 21788 bytes
SHA-256: 7e8ca0eee8316588886a66f06780bb0588b938a9de57d1b02d6bd815c1f434c3
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10840 bytes
SHA-256: 5f4a41bf62d92f6f3115d80d9a3337352d8f341e76c7e80598992365a88f7e02

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