Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c836b2eeb6aec60…

MALICIOUS

PDF

69.9 KB Created: 2021-05-20 19:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25e15727eda347b97fa5e385b664755e SHA-1: b7ea71e77df69347ece99f6cc7e19b6d14332222 SHA-256: 5c836b2eeb6aec60d41e7bed94006f58efc8d58274bedf269fc88fc3de8a0ece
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to programming a remote control.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=how+to+program+sony+dvd+remote+to+tv+rmt-d187a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fdaca284a5cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ff7c87f8abf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_600fca082a23e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_600362e503a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_603fad989b687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fea3a0c5994a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5fda0032e5937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_5ffd32ac48cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60371a4b10122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_604fc7a7c05fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_60394eafbc738.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/gomakobez/an_essay_concerning_human_understanding_chapter_1_introduction_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/27325775115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cfdf04-bb2e-4395-8545-056d7949d098/sisor.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/honeywell_focuspro_5000_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/vawofujobopanotazomafekuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5195ab43-9b0b-4482-9ac8-5047e51a6b92/5105573141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c95e2a-31ce-40fc-aea6-a935a6633995/what_are_the_four_basic_elements_of_a_good_web_design.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/how_big_is_a_6_quart_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb1c46a-aefb-4b2f-9a3c-4349177f6edf/mini_dachshund_puppies_for_sale_savannah_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46df7f3-a189-46a4-8f9d-9e36ff7b32fc/hp_elitebook_folio_9470m_battery_2_not_present.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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 5820 bytes
SHA-256: 50888413f0377f755e69a926cfde7826f98b4d13dc4b7598632baae116937937
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 9488 bytes
SHA-256: cd8adfa128e392fb542f63851696fb2f0d593ce519a4dfe621f9e3a4075d6668

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