Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74cfa90609476a0…

MALICIOUS

PDF

100.1 KB Created: 2021-10-11 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f13554396945d5add2b2fcc979bd38f1 SHA-1: a97f3dd3c032d5fb3cbc3a6bb02787c7da9c6260 SHA-256: d74cfa90609476a06e27b3ecf09909513c9d4eb7c75a42a6b97a0d9da79909fa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious URLs suggests an attempt to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/momobunamolus.pdf In PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/32148228162.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/ruxevolodivosenudedof.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/tisop.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/26856521295.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d31490c130---jamamimoj.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/76463481816.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/veruzek.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/38720370264.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/44245761389.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/49305506300.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/77432883234.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/ratobuvukapema.pdfIn PDF document text
    • http://fkhd.cz/data/img/23940499975.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/27710388748.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/76837426940.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558f87b5ce5---vapez.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/6819437272.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/tavipibunizupuwugoju.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8ce4f395e05d6a2f6cca7ce112b45983.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/37944671175.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/88552300304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ohip+sgfp+billing+codesPDF 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_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 21084 bytes
SHA-256: 58ba92579660bac5e81564faa37d2da62c80bbe64cf32731537e6017372b6956
font_01_sfnt_off00015322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15322 10704 bytes
SHA-256: 6fe7843fc3f61e6e990c9a610c7321d0e952330607a9ef07b45181ef7c2a6684
font_02_sfnt_off00016b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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