Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2a5dc81b3c8d65…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 17:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 494b550a87dd059aa5c8d09527a35f68 SHA-1: 09611aa055bf08ab9ddcaebde2bf27a31246fd33 SHA-256: 6a2a5dc81b3c8d654d9f7fcf6c569b802e761ac4a62899230a544e4dcdbb5359
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=evento+vascular+cerebral+pdf+2017 PDF link annotation
    • http://bewilotaweje.mywebcommunity.org/anatomie_os_de_la_main.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/stairway_to_heaven_bass_guitar_pro_tab.pdfIn PDF document text
    • http://tuwavetatifida.iblogger.org/animal_cell_labeling_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodaselawowov.rf.gd/hikvision_access_control.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/honda_gx340_engine_parts_manual.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/togelex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4571a80-bf48-4f82-a9de-e7659e30bbc6/31432597121.pdfIn PDF document text
    • http://jugikan.epizy.com/84242877252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893622ac-2a9f-44a9-ab29-98a2df1f0095/dell_optiplex_9020_motherboard_schematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11609637-54a6-4f43-9119-61b0095369f8/toy_scale_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c32cf-6fcf-48cd-9d6c-ba711836bdf4/what_are_different_types_of_errors_in_accounting.pdfIn PDF document text
    • http://jufomotapi.epizy.com/917639983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689d62fa-a0c9-4c99-b0d2-72365a449382/ff7_remake_guide.pdfIn PDF document text
    • http://bexatati.epizy.com/dekabudarurimeragurerev.pdfIn PDF document text
    • http://kipenul.epizy.com/tuck_everlasting_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e9f9f21-cabb-4f42-ad91-c8f839ba2b6c/best_portrait_photography_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e12430-c575-4148-8e10-4214ea087c61/95883845020.pdfIn PDF document text
    • http://musarozopod.rf.gd/71545596629.pdfIn PDF document text
    • http://lujubozugib.epizy.com/jspdf_add_image_base64.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e0f3c5-92a5-4cee-b0a4-8fdce9e50c1a/70468904810.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_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 5712 bytes
SHA-256: 39625ba8393186ebda5efbca8b18b7c50b11defdf7e1f52010268f519990ff94
font_01_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 11232 bytes
SHA-256: e4bb7dd3f12c278fed4511c2dd4af2d25400def8400e05ab4e185cfc1c223307

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