Malicious PDF — malware analysis report

Static analysis result for SHA-256 653c7ac06e2e422e…

MALICIOUS

PDF

72.4 KB Created: 2021-04-01 06:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 39b57cac804c4a178fd3b2dfa6a4347e SHA-1: c8a31a521d615f189d86452150f1f1077d22b073 SHA-256: 653c7ac06e2e422e36a0aecb6fc4c1b62179012313285d64188c6920739a5a1e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant number pointing to disposable or unknown-reputation domains, suggesting a link farm or phishing infrastructure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/award?keyword=autoimmune+hepatitis+score+pdf PDF link annotation
    • http://samubed.iblogger.org/86564435232.pdfIn PDF document text
    • http://roman-holidays.shop/python_range_reverse_loop7zir2.pdfIn PDF document text
    • http://reggis.info/76149372635e67k6.pdfIn PDF document text
    • http://tesazidon.22web.org/empty_crossword_puzzle_template.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/39890256441.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/10242704414cenx2.pdfIn PDF document text
    • http://topsale.pro/601489849539k1v3.pdfIn PDF document text
    • http://naturfresh.fun/911527661745ybbn.pdfIn PDF document text
    • http://testvvd.xyz/zomosonopebokonitelesona9iiu1.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/scratch_shooting_game_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojuxesut.epizy.com/the_natural_rate_of_unemployment_equals_the_sum_of_the_blank_and_blank_unemployment_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df30fec6-0717-4c72-9a73-cb78ebd47d9e/tukesexawo.pdfIn PDF document text
    • http://magikid.epizy.com/78302693156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0681d5-1463-4feb-8895-5ac8333728a8/c_programming_app_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fead57d8-4422-4e01-93c8-8fa26639667c/nedugowobotuzobiruvo.pdfIn PDF document text
    • http://rugadugekowe.epizy.com/bagok.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/dynamic_memory_allocation_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95bfe6e9-a8eb-4642-b699-ea6f7542da02/1000_places_to_see_before_you_die_calendar_2021.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/asciidoc_tutorial.pdfIn PDF document text
    • http://vomigok.rf.gd/veera_abhimanyu_telugu_movie_free.pdfIn PDF document text
    • http://laburebimefifal.epizy.com/degizofimumubol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed993f10-99b6-4431-bb2a-36b138903dc1/83407209522.pdfIn PDF document text
    • http://bogukap.rf.gd/19211375627.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 5352 bytes
SHA-256: 64ae5b2cf47ea1ae91c5f63d2e9ac19eda819d6878856d9d03cf1c084b629737
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10184 bytes
SHA-256: 409dcf62daa18a3ec8c401488c60e335c92157e14563748d77c93c61415b435d

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