Malicious PDF — malware analysis report

Static analysis result for SHA-256 969d1f7cc21e03de…

MALICIOUS

PDF

93.8 KB Created: 2021-09-17 03:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c31b242f36236fa34019cc87384fd7f6 SHA-1: 50dd904a11a5519065487887bc078936f6425a8f SHA-256: 969d1f7cc21e03deb778f25e96f840b8e8f120b3f740c52da633332c0bde4164
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://skogsformedling.se/bilder_umeny/File/jomewenagukupimew.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/1631764968596821002.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/filugaselazuve.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e090ac35b72eb05fa82adaea9c9f9e1f/tanoniwej.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23717906---paxifojeja.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/safiseweneteletapano.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mamunujazigeji.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/85143930215.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/goziwine.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/patikiwetudajasemewetufib.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/22656669467.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/sigokebilexotabobejano.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/20752335652.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kifaxefukapubar.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/6925066969.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/18428397317.pdfIn PDF document text
    • http://jcpingie.be/public/files/19299653396.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/69502885496.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/44797488799.pdfIn PDF document text
    • http://xycrusher.com/d/files/pakamulubiwa.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/36501676129.pdfIn PDF document text
    • https://priscar.com/documents/files/88226495296.pdfIn PDF document text
    • https://5uempat.com/contents/files/navosuresex.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/lejojujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=application+couper+musique+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_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10904 bytes
SHA-256: b4c9c2ff0f1551eb177d0b5a9bcd78eab4f46714f55b033b600e39d84083fb7e
font_02_sfnt_off00013802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 19572 bytes
SHA-256: 793f439f6f2bf0b4de78c68a5a7383b85d1e1840a60585446f9aca6a4b106c63