Malicious PDF — malware analysis report

Static analysis result for SHA-256 85305009f1268e8d…

MALICIOUS

PDF

80.9 KB Created: 2021-10-07 16:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d022c63b7433a490ecc4f188822d38f9 SHA-1: d0f703c324a882e767fda23e60640d8ae360c64d SHA-256: 85305009f1268e8de54684b33bce5d748d31474695fafc7f3323b1dc9ad5f82e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics, including ClamAV and an ML classifier. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=case+study+of+house PDF link annotation
    • https://habibitours.com/ckfinder/userfiles/files/51560967315.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/vegugadaxegapuxirod.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/30486451454.pdfIn PDF document text
    • http://rbmtechnik.pl/userfiles/file/35669207810.pdfIn PDF document text
    • https://fq.ua/images/file/letisajorof.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/60712888967.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/86758264658.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/supurugutegimemab.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/15161684739.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109070624208757.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/37404319566.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/2258606290.pdfIn PDF document text
    • http://inercial.es/uploads/files/39139293129.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/binexapoxajizo.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zesiku.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/223151edc68a8df1b72e677ed1f55057/tikugonajomidutex.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/gibepawinenuluku.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/titenola.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fuzuwaguturiv.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/99319486624.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/sopebafetu.pdfIn PDF document text
    • https://anciensite.ville-rouillac.fr/docs/file/sifabaditesaw.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/51925502665.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2e8215aca---8736767375.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/37860261676.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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 17740 bytes
SHA-256: 4671c483cc4372965fc38710aec99411ef6cd39e2e8073a1bac85ec0a9e4d260
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 10352 bytes
SHA-256: 02592787bed03d907c8ebab56ab155292380fe12a1dc767201956f2b758c2d91