Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c35894f9d10b1a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 20:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57184cf6c5effe055b2b1cd4aa39f4d7 SHA-1: cddbd457ac606c3038cecddf7cd145a9c317054b SHA-256: 81c35894f9d10b1a7de22d649e2aaf8f722eae7592ec0f86fd45b5965bdce9be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and embedded URLs indicate an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=fire+tetrahedron+theory+pdf PDF link annotation
    • https://grandplaza.bg/uploads/assets/file/wurizutevejowijoka.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/varutovuzanezali.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/73454718097.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/forisojaxini.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/71554469549.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/17158754613.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fekakomi.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/jevozevimego.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/robejudaweropejixisaf.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/rowemozifobunerumu.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/luzomudikemo.pdfIn PDF document text
    • http://vina2002.com/uploads/files/tagozevoretasaziperosu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/tupuxorenaxanejelewipaja.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/koleredagixudogutoma.pdfIn PDF document text
    • http://fullx.net/files/modomisubixelojemebivur.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/24862537334.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613016da64828---jubireg.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090811251454.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/21792848605.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/gevevinokilijupujarur.pdfIn PDF document text
    • http://idcla.net/upload/files/gitexawozezuluketobilexu.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/jarafavepevek.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446628c378---39904912135.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 10472 bytes
SHA-256: a16f90431414cf837103b14204bba8f693280a3958b87734cdf297c1d7c796f2
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16664 bytes
SHA-256: f027a703f90d174fc5245f40eb953da3e72d9dbbcc0645200e2b091bfeebf1a8
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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