Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba255aadc4e50f3…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 14:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df81eeef667a653b955aef62a7bfc2cb SHA-1: cefa4c3dea7ac24ce1d314ed6e84c7e0a04bc2c3 SHA-256: bba255aadc4e50f311bb181c73ba5302ad2eb81b6d13e907fe44a86c0509c576
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452e380af81---xifubexexuvim.pdf In PDF document text
    • http://kelvista.lt/images/files/mowetokew.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/64114076029.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/divef.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6d77ea43---risagofeworaz.pdfIn PDF document text
    • https://ijpdua.com/contents/files/14831634733.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/viwegimowafixitekapegege.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/regaxafumadefokejeza.pdfIn PDF document text
    • https://anup.bo/images/files/fuxaxakevunixinesazusaj.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/95462911370.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/giwubokeseselekizida.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/34167290794.pdfIn PDF document text
    • https://pisausakti.com/contents/files/taxadigatavuzadu.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/1584009919.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/disaruxobuluwupesenavo.pdfIn PDF document text
    • http://becucci.it/userfiles/files/fijikeboxavutigekijatujo.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/94132850284.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/83569035058.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/79865234521.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/12443697125.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/timujefukilosavagoxune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gfx+tool+for+android+11PDF 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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 10240 bytes
SHA-256: f115c1452f1cded693ddba965d3f5f95d074512b8fdee796ad95b41f7c00ac43
font_01_sfnt_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 14728 bytes
SHA-256: 70e43e03c3d342ad526c03faa3a12e4304b0a1ec0bd73105cb94546b8a2f13c1
font_02_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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