Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd69708a7c0fe8…

MALICIOUS

PDF

69.4 KB Created: 2020-11-22 00:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 087535ea7ba7177512f6ea421e1c675a SHA-1: be6fbc95774d6d514c87b5c50f6fc55768a0eab8 SHA-256: c8dd69708a7c0fe840c837f38d1711ead0c4f0d84e64a5113a5b37271c93ea5c
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt, and impersonates a cloud document service to encourage user interaction. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=all+android+meterpreter+commands PDF link annotation
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/wifedir_fajevapenib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fa713f959b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_5fae1727a3c77.pdfIn PDF document text
    • https://pagimoroxu.weebly.com/uploads/1/3/4/2/134265496/baf7ae1dd8695.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/gununemewepola_biweg_pibes_kudadasivufixod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f94fae58c5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fb60be3d7714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f980e886f44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5fa3718d5fd19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_5fa6f4ccb74af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/exo_mountain_gear_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/recover_deleted_files_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/classic_media_player_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/57836071747.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 5208 bytes
SHA-256: aeb5b3dc65cf924d23440fa478e76735ac8780e28f4013adef5e2ae34eea4b15
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 11048 bytes
SHA-256: 1bd33ce42060c9eea787b1faba3e2eb07dcc1284c03170ea6bfceeddddb36213

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