Malicious PDF — malware analysis report

Static analysis result for SHA-256 d837686d44fb1e50…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 15:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acff6f345cc35615c0e25592c2713160 SHA-1: 5f49e228c6b2918412cafc2ea8e394c6555f6bc2 SHA-256: d837686d44fb1e507939d73e6d1ab54c50c33d0843a25641b1eb7ce4135cc57d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://illustrations.noche.fr/images/files/pipovumosu.pdf In PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/valikedebuvobidada.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/acf16d1228b04a2cb61bde15b76648a3/15137867411.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/876394694.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/nuvedavenonaz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161386b7305ef3---65865978618.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zutirajagojelukagagira.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/15519580690.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/ruxogepe.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051702162288.pdfIn PDF document text
    • https://5udua.com/contents/files/buxuwedigizorewepidiro.pdfIn PDF document text
    • http://llux.vn/uploads/files/66985687780.pdfIn PDF document text
    • https://km2804.com/ckupload/files/babapewabeka.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/2144412596.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/jexebaketurajunexuwumari.pdfIn PDF document text
    • http://abworder.com/uploads/files/kuwerodejalugisigu.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/morimaxoritoxuniribonu.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58756875943.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/55695957385.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/44128918217.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/21892671733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=aurora+fortnite+free+skinsPDF 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_off0000ad97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD97 10336 bytes
SHA-256: f3b8d0b9885d574b4f05b8aca35c1ea05b37de1932b4e15befec836f2c9fcff5
font_01_sfnt_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 16612 bytes
SHA-256: 4b2bf38f636c8ea1d9f82d45f47c85b934abd5d57d6e143d80b85948a72bca31
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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