Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c029b1c3b9dff6…

MALICIOUS

PDF

90.7 KB Created: 2021-06-14 03:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7d99b3cb8d26e49c3b8bcb31b806cd4b SHA-1: d1e500ab1d47c6f535189fdfc82843ab8e090b43 SHA-256: c0c029b1c3b9dff64082c69d7bf7e21630005a058c321ae650d2726f3e6e1718
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'catamma.ru' which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a workout schedule, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/wb?keyword=the%20firm%20fanny%20lifter%20workout%20schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380392/normal_603b3f602cdc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_6004854c3e9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_6010c4e8ab4fd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371248/normal_60b4fe59ce380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_601f4111c0f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5fe86937e7275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60677b9f72cf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugufosenene.pbworks.com/f/nizijudeloxebetilotixavak.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/production_management_textbook.pdfIn PDF document text
    • http://sawebaz.pbworks.com/f/metodologa_de_la_investigacin_cualitativa_cuantitativa.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/f/42622124135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a59e70-b334-425c-aa55-d98e35da6eff/the_island_castaway_3_lost_world_free_download.pdfIn PDF document text
    • http://biduzoku.pbworks.com/f/how_to_install_epic_games_launcher_on_different_drive.pdfIn PDF document text
    • http://diruzonedod.pbworks.com/f/76196825254.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/17753831515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2f7a26-5de7-4abf-a0ac-03cb29df3560/63679413715.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_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 5468 bytes
SHA-256: 70514d3fd670414449195209014524d30e10a5af089dac3acd431010262ef8e7
font_01_sfnt_off000134e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E8 12200 bytes
SHA-256: b39ecaf4f46a43d61750a44030f3da8d6ff55b48439d794abdc01eafd14d5aee

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