Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a8deb3ed109f31…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 02:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d418f846852676dab6c4cbe9689b822d SHA-1: bfb07601459f34b83f2ec0e007e19017daf7d481 SHA-256: a9a8deb3ed109f310d37d00b301fe295e2ccb8aa9eed1b1e9fcbbf69a90f5244
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a phishing document, with a high ML score and ClamAV detection confirming maliciousness. The embedded URIs, including one pointing to a raw IP address, suggest redirection to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI findings strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://koratspring.com/upload/file/vodomizovil.pdf In PDF document text
    • http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
    • https://blugarden.eu/file/goboweniw.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/36683850923.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/68199120515.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902134633.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/voxudijuxetegopogalafuvo.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/bagedinomerexuraxon.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/53235271629.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/mudunarakegazipuzuduke.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/82769357508.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/fibadimutaseforagezuros.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/51605523288.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/13097671088.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7429ffe---virufu.pdfPDF link annotation
    • http://atsrealtyvietnam.com/upload/files/nujit.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/95429832403.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109030932288244871sjshy.pdfIn PDF document text
    • http://scsytech.com/upload/files/gikagidivudes.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/84316650022.pdfIn PDF document text
    • http://fteq.ru/files/file/bugixepadatoximod.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613611efa83da---96621469851.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/41715219403.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/supov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=image+caching+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_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 17296 bytes
SHA-256: 7eac3111a8ea12c474ab8fae3157c17a15b8beedaec9b3e6b309be00f663fdbb
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 10456 bytes
SHA-256: 8f94484881be0c72756755be78554a92ff1dd6c5d53c7826ed89a4beb2559ee5