Malicious PDF — malware analysis report

Static analysis result for SHA-256 778d765f47be7053…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 23:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7029b8551e73fec831ef53d224ddfedc SHA-1: 9d5a2532724b9ec67da44b55f7840a37a9e112a7 SHA-256: 778d765f47be7053cd61381f9ad3c97dafe4658799f439b18ffeecd61596d8d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of many links indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=chhota+bheem+game+mod+apk PDF link annotation
    • http://i-harmonics.com/upload/files/70740444528.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/40223925124.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pimebepa.pdfIn PDF document text
    • https://stvorki.ru/files/file/16144195550.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/fadalabosasigovux.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/55247552730.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/38782899695.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/72987425924.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wojaxugefenojodinuguzis.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/zopopasatevewunujaf.pdfIn PDF document text
    • http://cascad-trans.ru/files/68927634895.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/608106773.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/52078652787.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/48148551241.pdfIn PDF document text
    • https://austarpharma.com/upload/files/37823071658.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/79922963021.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909120458.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kodetefodis.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ca624b348e6b1011599c6563dcb9e9ad/kipimak.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/rubisidubesijodi.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://agentcctv.com/userfiles/file/gawinimasovegisuxalosujaz.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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10592 bytes
SHA-256: c1e638b76801f688a3b92ddcd01529dad8a6de20444a5824fcc2a27d6d8e46ed
font_02_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 17536 bytes
SHA-256: ddb2201498370afd8c57d5eafa2aefaa287ac32a4b7b2e5d16d22b86bbf93beb

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