Malicious PDF — malware analysis report

Static analysis result for SHA-256 909a14e1cf27def3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 06:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 600cebe185342c495622472bb741dca4 SHA-1: a25712c130baec4572acba076d84f5311b825430 SHA-256: 909a14e1cf27def31804ea99430601f2c628f17eeea126532104d88efb9ef9b6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands. The presence of numerous embedded URLs, many pointing to potentially disposable domains, further supports a phishing or malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdf In PDF document text
    • http://studioschicchi.eu/userfiles/files/80700766673.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d45ccac---zusere.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/minupumamo.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/51482070280.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jizizagivafup.pdfIn PDF document text
    • http://usateatop.com/_upload/files/babosaluk.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/53743803923.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/22745792651.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tufider.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/86183052524.pdfIn PDF document text
    • http://abnicum.com/files/file/44104834960.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/18943584965.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090303321527104.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/xitabufowadulaxezololafe.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/viwijudabinixorolune.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wirumudonofibifugo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613286268951e---49317896349.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/medijaludikebajaropos.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/89042261548.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/joraxosetugusesijunewisa.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/moxapofofuju.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/43350508900.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/15931111797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=screen+share+phone+to+pcPDF 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 10408 bytes
SHA-256: 7fa84fdcc0271a4b82c7c9d54a25cdc14bc2dcc51b0b544ee36e7443a3dbe0fb
font_02_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 18512 bytes
SHA-256: 764ee0df0647ba27c2726b50c9733995693872074a8ccd6cf5b960ce5ae385a4