Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca21ceb277e5eb…

MALICIOUS

PDF

78.4 KB Created: 2021-06-05 18:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d64376c91eaf6b9d7c64e965448b05 SHA-1: a9ef320208507b15f3b110c70958149839867044 SHA-256: b5ca21ceb277e5eb8536a08d4e611b83d0d8d09e1b6ab940c95df6c1e2ac9c68
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'catamma.ru', which is likely the primary lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how%20to%20get%20a%20driver
    • https://cdn-cms.f-static.net/uploads/4479916/normal_6031949d9ee8f.pdf
    • https://static.s123-cdn-static.com/uploads/4392462/normal_600406045074f.pdf
    • https://static.s123-cdn-static.com/uploads/4386366/normal_5fdf060841ab3.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_604b49c2b258b.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_60551df09c6b7.pdf
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64bcbb37d7.pdf
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6065589974b3c.pdf
    • https://cdn-cms.f-static.net/uploads/4475987/normal_6063e9e4bd1c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f7b90a6-26c2-48c5-a058-5e6093355718/can_i_renew_my_ga_id_online.pdf
    • https://uploads.strikinglycdn.com/files/223302fe-4784-49a2-a1c1-e7c0bf888d01/maytag_bravos_xl_heating_element_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/3e04e813-f540-4ae9-9dc3-0aa98d7a7f81/22636384868.pdf
    • http://tezalef.pbworks.com/f/computer_organization_and_architecture_online_course.pdf
    • http://dijakezepo.pbworks.com/f/86133639302.pdf
    • http://kedetuwi.pbworks.com/f/sebinewejasodimo.pdf
    • http://sikawejedi.pbworks.com/w/file/fetch/144627438/47778713543.pdf
    • http://labidan.pbworks.com/f/gowepazajinu.pdf
    • http://lomexalipele.pbworks.com/f/can_you_get_more_watch_faces_for_apple_watch.pdf
    • https://uploads.strikinglycdn.com/files/32303c41-8502-4dd6-acbc-786886c5ffd4/cuidados_de_enfermeria_para_una_trombosis_venosa_profunda.pdf
    • https://uploads.strikinglycdn.com/files/7f8e9cf1-35e6-41fc-9ea0-6ac47d7f8761/how_to_name_a_story_book.pdf
    • http://siwuromo.pbworks.com/w/file/fetch/144425316/diferencias_y_semejanzas_entre_los_gneros_literarios.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53e.bin
302cd6682c5245ddb15856e25d6461979c1d264079cad04261705ff03cb21cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 5508 bytes
font_01_sfnt_off0001080e.bin
9ffb828a6a3b1606881d1d6515d7ec6ba9b77313c2b56fe34890109979ed9720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 10952 bytes

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