Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfba2e03f169087d…

MALICIOUS

PDF

72.5 KB Created: 2021-06-06 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 05aecfe9e54de9331012656e75e346ce SHA-1: 9d209814a1f31b8a0cc118c7c672f1fd3c9bab5b SHA-256: cfba2e03f169087d86a6ff4260fc8dd3d0ec900343f773e3b8be7660c453cf8d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://chcial.ru/pbw?utm_term=libro+m%25C3%25A1gico+preescolar+pdf', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/pbw?utm_term=libro+m%25C3%25A1gico+preescolar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453720/normal_603c6d40572e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_604bb40611d43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fec018419f76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_5fcd9017c849e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_5ff0d6d15538a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_60268dc1c2720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fba63d-55d0-4c10-bbc6-e30d9b63c7cf/nugusatu.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144560691/heat_and_mass_transfer_fundamentals_and_applications_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5f6076-713e-420b-ac6b-b12d37223e02/the_odyssey_summary_book_11_and_12.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/95677922214.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144517377/how_to_update_firmware_on_mxiii_android_tv_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b23a49-71c0-4179-96ab-70a4f5d5424d/48033974021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546f2e4b-21a3-4309-9431-0cba53910a7e/dell_n5010_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b225707a-c950-4e7a-a956-28b4fa0f64ff/rekuparexeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c45463-dde6-4116-aec9-59b461f2e9fe/xuralarivesafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1582e90-af85-4662-ba29-533cf7ecc59a/learn_korean_language_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a260ed-a65f-4fbf-96fe-cb577c561458/how_to_change_color_on_afterglow_controller_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce3b114-7bb7-4d86-87cd-28a28be28efd/kiwico_tinker_crate_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c81d8c0-1e30-477b-803e-081e29c43eca/86513145762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0764b8b-8ca2-4cff-ba2d-9780f96800da/lord_of_the_rings_elf_king_actor.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/rufulalironomim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a1bab5-5e86-4c24-9c08-9f16b2dd3464/97757275146.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 5792 bytes
SHA-256: 14d8557ea296555b012153e85370ce116cbfb1de8c029e8b194f1ad653644436
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 11048 bytes
SHA-256: e5a885b306c51c7c35c0c272e815d0ff94a7917185a9dfdb78b718969566ab8d

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