Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d48968eca554f82…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 16:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f57eefcbce95c05bc8bcd3c1855df8c SHA-1: e783656ba00b417edf6245eab31da8c20bf5ed47 SHA-256: 7d48968eca554f82432ea45969386e68e1f83e87a0f404fcb1b4a26f2c80e81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nelly-design.ru/upload/files/36274110992.pdf In PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/53294233843.pdfIn PDF document text
    • http://iviltra.lt/images/files/finovufizaligaja.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/kofaw.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/33190423886.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/92791816700.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210915195224.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/90583392823.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/31194204386.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/40184339667.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/nuxodixosumirukefuniditit.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/48477885097.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/wonuwerofiwowasudap.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/9195151196.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/zulamijazexo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/19943377553.pdfIn PDF document text
    • http://salwex.hu/file/pevejenebaxoruda.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/darekajodi.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/lixirosajeko.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fc50c649---kafinuzito.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9f00d7a25---8410983753.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/45037907584.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65569080181.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bunesejatazidugavirerad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=you+tv+player+descargar+2019PDF 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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 18964 bytes
SHA-256: 870d512102277de50338c827973d4ea0ecc68a2d66cf511012dde890c4e14e22
font_01_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 11216 bytes
SHA-256: 4c8dabf51652b6bb80db5bc29946ef2bb9349feb7673d38207aceecf3173caa7
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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