Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd5ed8fddcae03…

MALICIOUS

PDF

73.0 KB Created: 2021-04-03 16:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cabae852435179ca22afe918f465d503 SHA-1: a4839158bf7b4e8c784a0d1102e07ae34cdaa55d SHA-256: 16bd5ed8fddcae032513b2c5c4ebeafbd89005eb0850611cdbb10fce15e8dba3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one pointing to 'kuzutuzo.ru', suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=kenmore+elite+oasis+he+top+load+washer+manual PDF link annotation
    • https://cdn.sqhk.co/sudofeno/cEidDhj/10643022364.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/hgclZ6p/how_to_draw_baby_yoda_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_5fe81d43d32aa.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/cYhiiaW/flowerhorn_care_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_6049b3f052d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5fd69c41bf666.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/2113248.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/varikepokiboluvo.pdfIn PDF document text
    • http://medefoduma.iblogger.org/latitude_e7450_driver_cab_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_603d2f9d24e1b.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/acst_aakash_sample_paper_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_6006a389b0def.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/Hkiaham/zenebixuvurezusevuxeteja.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/giwug_rojazap.pdfIn PDF document text
    • http://xubegureluju.22web.org/the_art_of_unit_testing_third_edition.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/chaupai_sahib_file_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipokeviti.atwebpages.com/rapugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62de5a7-299c-4f80-90e5-c88edd3c70e6/xurototojanawegufexesix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439a00d7-e250-4d16-8832-7f305380b341/93956284252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a913ea-2238-4f17-8f81-d0503c54d5c6/is_ninjutsu_better_than_karate.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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 5260 bytes
SHA-256: 5636090c7230d31fb4cbf87c092e4f11f964510b722fbb41786e88986f9060ae
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 11964 bytes
SHA-256: ce97cbc92c49122723d32a29fcd86c42a37d767a07998a77b00fe186463799c4

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