Malicious PDF — malware analysis report

Static analysis result for SHA-256 872bd93fd6eb500a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 13:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbbeb8b7aaa0af5944bb0d1a3323b5ef SHA-1: b30f64676d6d9017a9a4a7df84b79a37ba08c3dd SHA-256: 872bd93fd6eb500af37bc65188a4e5a4f01cd154405136b355beeede0adc539f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://dobrasekacka.cz/userfiles/file/vinisegabogorabibepo.pdf In PDF document text
    • http://gwynnoak.abwingsmd.com/uploads/files/93600026785.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/50825916636.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/62560374461401c8b1c06b.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/38405258032.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kawovotuxaw.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/71404586153.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/dojusuxijuzi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zajabiranos.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/jinuwasi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/33769426585.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/senajoxubasu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/pemedaxabevukasofadunija.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/10783049416.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/newawojofelojijidis.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/17351893335.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pabosafuwebisufex.pdfIn PDF document text
    • https://mackbeks.com/files/file/wetunawanuvamuwebalibi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/2566319181.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e73f254cb743382fd080b943dd3dc19a/72656221466.pdfIn PDF document text
    • http://canoeing.by/pics/files/83608671821.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/13524533604.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ff28a9fc---dumowaxapuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+attachments+outlook+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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 17960 bytes
SHA-256: 83e3272264ac3b24308df2a04358ef6f66294121e5872936ff8bbbe5baa15e1d
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10904 bytes
SHA-256: 4bc8c16aea7f56801f5f6d527ff9fa169da831c2b482a7d530ff99bd72a2b40e