Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e251c6dc8fbf047…

MALICIOUS

PDF

155.6 KB Created: 2021-09-10 07:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aacc28a76f08b33188589706dd1bca30 SHA-1: d89cc4571f9f6bd749d1d24cf812021a3ba8e798 SHA-256: 4e251c6dc8fbf0478f45521701953680c91c15cc0ed24e585c7c784fbba7d20b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards an attack pattern involving directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://wastran.ru/uplcv?utm_term=brisbane+city+postal+code PDF link annotation
    • http://eviljoy.com/UserFiles/File/54455407904.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bdf3ef2ae087faa687eb64f7c6712182/vazej.pdfIn PDF document text
    • http://myphamasia.net/upload/files/36753072824.pdfIn PDF document text
    • https://nyig.com/files/file/80951487075.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tagedelefu.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/dolimugi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/77853292494.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/dasesodogaromilo.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tikategezuzilogilaweluw.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/172440432461383606d85a5.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/jexobosorejegituj.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/besesemesuv.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/wujar.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/41898554630.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109050643214357.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/67043203255.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mirusifoz.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/viketejip.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/34407334497.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/giruvonafewivefigisagemit.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/17798055995.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62453499306.pdfIn PDF document text
    • 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_off0002009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000218b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218B5 10812 bytes
SHA-256: 835f8829a7afb9759dc0af6cc39cedce3a712bdbd76de57d869047a9bc04b806
font_02_sfnt_off00023197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23197 18140 bytes
SHA-256: 03d1bd27da688ce4817856f5637b6d385c3daafa7170591e7ad70c98c19b56ba

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