Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ebba70f845c63a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 04:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d37b76bf70080d49f5b28f73a71a5f3e SHA-1: 8a8b8fe86adcd5efd9c815843075728767779cbd SHA-256: 76ebba70f845c63ae26beb9600ce63251b08b2c2c93856e506a59940c598aacc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or are part of link farms, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest it may attempt to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vitanov.rs/files/47694278716.pdf In PDF document text
    • https://sayurmateng.com/contents/files/5124329260.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vulozonudezowoxesokukukuv.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/nofubovuram.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/dabom.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/15161525709.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/38188265.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/vapugakifojezixukelofo.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/52407830753.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/zonerebumebanugogakimuki.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gasirekimup.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fudemowabafexifisoperazar.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/64545452385.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/62613630364.pdfIn PDF document text
    • https://kimcert.org/E/file/xovufemadugaduwitajovaru.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/joxikuduluruvadufu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbcd8d8a7---wudutovivuronexijetepevem.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/14973675137.pdfIn PDF document text
    • http://vecsecity.info/editor_up/xiwukamixinado.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/91230226061.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/lefijogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+phone+under+12k+in+india+2020PDF 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_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 17504 bytes
SHA-256: b8ce77358e165209cb71a9c5bee90dbac62f8d97d2c3a1d200e98d94645ee24b
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14840 10980 bytes
SHA-256: 438e5685d4456c764f68b59fe23459c370bd768b29bb7bcc3e0ed50cdea726af

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