Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f696d6fbe7e996…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 17:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4109e3acdb19af60932a2401f2424fee SHA-1: b70177dd7c0ce5011decfeab83ffcaec6121bc0c SHA-256: c2f696d6fbe7e9968a333bf11a48d3743ed957ed03b52427402c16f5434b67aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aven.su/userfiles/file/jepizomujazidujukun.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/71722967256.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tujujajewudise.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/limakoguzuko.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/6893330511.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/savikavesiwe.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/74835595061.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5b6f6ee---sabupodisopetasubub.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/22264146205.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/basonugerewokadut.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/lufovidesutakazifixi.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/woruwozenimakoxafujeb.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/34598370001.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tubarofekubadoxebawu.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/panosuwibuvabudulujaxiw.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/kazasamuxalabu.pdfIn PDF document text
    • https://birotex.rs/images/files/lubobudenipurabigagas.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/81016815199.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vedebo.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/69548234725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bitmap+from+drawablePDF 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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 19280 bytes
SHA-256: 7e6b20b7517c9dc4b731c7f0cd98d62ecb65d7577306253a69a12a76543848e1
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10668 bytes
SHA-256: 080dba02fff97a0c92dbf08d320ba076328d12f18a277b2c431b8362738ca749