Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d117b99e4f83491…

MALICIOUS

PDF

122.4 KB Created: 2021-06-10 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5ec737f14e6e847729c37b2bbc74156f SHA-1: 16d30d707703ae01a3a8b5722c1f256eb6dc7406 SHA-256: 7d117b99e4f8349186394841db6952f36de8272e97923d8aadab4b2fb656dae4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nomylo.ru/pbw?utm_term=plants+vs+zombies+fusion+hack+animation+game PDF link annotation
    • https://dujuzesafe.weebly.com/uploads/1/3/4/3/134355225/soluranixoduxopag.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/f8a3b9c.pdfIn PDF document text
    • https://zikagegivexu.weebly.com/uploads/1/3/4/5/134527251/0e08929fd.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/4b616b.pdfIn PDF document text
    • https://jofovavugelizud.weebly.com/uploads/1/3/4/8/134855980/fotexo-dubunoka-xuxutotokutoloj-ruzupogalal.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/f59dee4b46.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/livekofige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73e1ebb-6b0d-409d-bd0d-7ca7f36eb14c/mowavadokodonugir.pdfIn PDF document text
    • http://lurilimid.pbworks.com/f/45919210890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4954d7-9aa7-472a-a6b0-0893c5bd0589/jamelivupibegipinel.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/45832927936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee993fa-3360-4a2b-9243-f04fb9862f15/roles_and_responsibilities_of_operations_manager_in_hospital.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144421494/descargar_cantos_del_camino_neocatecumenal_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5367f5ea-3235-4d5a-963c-166f6284baed/curse_of_strahd_plot_outline.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412611/guzopuvosonudojukum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ca859d-9fb9-4e99-82f0-57cab4c7c816/zigabosexozivav.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/joxamafojagezabedef.pdfIn PDF document text
    • http://wimarolos.pbworks.com/f/detanonoxadofanifaxufu.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144654303/your_freedom_vpn_cracked_apk.pdfIn PDF document text
    • http://lufokomarib.pbworks.com/w/file/fetch/144476808/how_to_pair_jlab_neon_bluetooth_headphones.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b167.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B167 22780 bytes
SHA-256: c56669853cfcfe5a111621abedf78edc63a2b5e2bb9b542077e6c76e04e2e7d2
font_00_sfnt_off0001729f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729F 5516 bytes
SHA-256: 0b44974fbc66530f357d8fca296418b6070614902c8524cfd355f36d7da0d36a
font_01_sfnt_off00018557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18557 14308 bytes
SHA-256: de2e005673e9b234dee39cdde88df76c2e3afdc1ded1f899fe95a9e02dad1c8c