Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9ede2d46a0596b…

MALICIOUS

PDF

88.5 KB Created: 2021-03-14 03:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d8590b62433d6ed9b55ceaa2ca1f23b SHA-1: 25572e463406620782dd159995f4d4964c4e9ab6 SHA-256: 0e9ede2d46a0596b9351755c370e56cf58771bed122b0fe3777e53b742bd3b6c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious content. The document body, though partially corrupted, contains text related to 'playground safety worksheets' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=playground+safety+worksheets
    • http://italywow.space/customer_journey_mapping_template_freeuwmjb.pdf
    • http://remastacer.com/android_sdk_location_mac_android_studioqm8t2.pdf
    • https://cdn.sqhk.co/gavezexu/g4R3cVf/poly_performance_synergy.pdf
    • https://cdn-cms.f-static.net/uploads/4485173/normal_602c6e29ed089.pdf
    • https://cdn.sqhk.co/xakawituk/eigLtji/19374664535.pdf
    • https://cdn.sqhk.co/ruxuvedije/ihhdhlC/rolling_stones_retro_shirt.pdf
    • http://rcasino.info/nutevajadoruwoliloniximli86o.pdf
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fcb20ea3c11d.pdf
    • https://cdn-cms.f-static.net/uploads/4468261/normal_600efeee3327d.pdf
    • https://cdn.sqhk.co/dekawako/DiiO7ge/hangover_quotes_alan_who_let_the_dogs_out.pdf
    • https://cdn.sqhk.co/xefijumu/haPkhj2/how_to_get_simplerockets_2_for_free_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d5ccb0c-6e37-45a8-85ef-97b93cb23e52/agatha_christie_short_stories_free_download.pdf
    • https://uploads.strikinglycdn.com/files/e404040b-d775-4f91-a9e7-af8358962992/50139452264.pdf
    • https://uploads.strikinglycdn.com/files/31ff6e49-ff16-4dbb-a175-885907766d0c/what_can_i_eat_on_purium_cleanse.pdf
    • https://uploads.strikinglycdn.com/files/e379ce6f-5910-41e9-a92f-c181ba4780ce/what_is_a_good_weakness_for_nursing_interview.pdf
    • https://uploads.strikinglycdn.com/files/e60f845b-72c1-45a8-9443-b5014e003fff/how_to_say_it_will_be_okay_in_spanish.pdf
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_b0395b076c7a4358b4967f4530b54d0e.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_490acc2fafd844229939fb1fa1a581b8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/457a8c21-c372-42e9-971c-46706f0608a5/7635003332.pdf
    • https://uploads.strikinglycdn.com/files/30039ba1-b8a4-4e80-849f-b4541a70f215/kipejaliler.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_4fb6de74ef64487e97ac8b052e9cf1a4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075e.bin
02c63409b10b52b696bc0494e0f06257a2e3df4951f70eff8a9626988d023c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 5428 bytes
font_01_sfnt_off000119ec.bin
c11d36d1122167b55c355bcb47e57364f99ececc33d8ae9b4986185da8ac6f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 11036 bytes
font_02_sfnt_off00013fc1.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 16092 bytes

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