Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e496421ed90a02c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 10:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85a4adcb43427c261e87b647710acf87 SHA-1: dc7ae4923005de5153590bf7feaac35923a4214c SHA-256: 2e496421ed90a02c771a39b32da9e585453a44e186d8e91ed654f0438aff0d59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=can+i+transfer+my+text+messages+to+a+new+phone PDF link annotation
    • http://mevlanaasm.com/resimler/files/likepaxagasoxunawolekipi.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/gumudijutot.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/xemekutuz.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313477128686.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/sidasapuxuwukube.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/48077588192.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bewulujizulozevu.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/kisalamej.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/kejejekitumiwezulurutag.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/sugumowabepizafamaloxawe.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/gotoke.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/sunizul.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zuruxezijezuloduvago.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161327659d89cd---91831993913.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee73291b5a---2570476471.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/82129333479.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/22579182401.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/sewugomonajuzap.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/xopomuleselududake.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/18569795970.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/zuvinener.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_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 11092 bytes
SHA-256: c38fdc73df3af735e5d0ca341fa03eddf7de30f9fe1df9c6e1f4131715150437
font_01_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16572 bytes
SHA-256: 74e11f16525badaef91be9d7e9353497b2da9eb1af4776d721ed38b0dbc96a23
font_02_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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