Malicious PDF — malware analysis report

Static analysis result for SHA-256 72243b143f4d1ff8…

MALICIOUS

PDF

76.5 KB Created: 2021-05-16 01:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b4e01cac51f321afba8becd0ae917fbb SHA-1: 40b3df5cda3a00e5bd6a619d4080c61f6e024b3a SHA-256: 72243b143f4d1ff898ed9b79c0dc51e2a8a79aaa6db77d15cdbe03b2d935e241
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and a phishing attempt. It embeds external URIs, with the primary one being 'https://nipisod.ru/strik?utm_term=how+to+fix+samsung+smart+tv+not+turning+on', suggesting a lure related to fixing a Samsung smart TV. Several other unknown reputation URLs were also extracted, indicating potential redirection or payload delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+to+fix+samsung+smart+tv+not+turning+on PDF link annotation
    • http://tersq.space/760045715178qzul.pdfIn PDF document text
    • http://academic-club.ru/7298029999035ssj.pdfIn PDF document text
    • http://podcard2020.site/nuxajozuxiga1bclx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5fe673f69fd3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6023d1803591b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_605ca42ca9889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601fd2d874ae9.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/zifilobesumafi/anaphylactic_shock_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/zomovavabosigefuki.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/on_the_outline_map_of_world_locate_continents_and_oceans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6f2894-1ebd-4b78-bad5-9cf3becf4666/the_book_of_martha_butler.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/belerick_guide_ml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f401e36-cb38-4511-aaf8-00ca48f7d7c2/fluent_python_clear_concise_and_effective_programming_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/96743395727.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/24869764812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36178750-e2ec-4b97-ad8d-2da0a45ea281/holt_handbook_third_course_answer_key_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/4753813364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef35aa16-fed6-4683-8cde-eba4dfaff60e/can_i_still_use_my_jawbone_up3.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/65151529527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76397da-806f-40cf-bab3-e744749d533b/julian_calendar_armenian_christmas.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_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 5236 bytes
SHA-256: 55303d1f1f3a61624e7b0606f8ab80ac199c2f0bbf1bd72db015ced8c700ce68
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10372 bytes
SHA-256: 9f5c617d2e4f8d04c5c8d9dfc750d19243b16d1f66afd193182fcc690e741cfd

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