Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f79c1fa858eb74…

MALICIOUS

PDF

70.4 KB Created: 2021-05-02 06:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d34da8836a0b0b00694c5dc777fc11c6 SHA-1: 70e0a2e1f1a0b8c519b4456fd0ed88ea7b22ff6c SHA-256: 05f79c1fa858eb74ee52fb578fa4ecf2e78cd807f46f63a2b3095122a3bacff7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+the+main+plot+of+huckleberry+finn PDF link annotation
    • https://cdn.sqhk.co/gupimupiset/icQ0GFe/empires_puzzles_beginners_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/ifTQAXE/emulator_win_10.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/classical_guitar_strings_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/RJpVLnZ/66073488296.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/recurrent_and_capital_expenditure.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/67b55dfc-b4c6-4638-b6f7-1404583c5a3f/yamaha_r6_service_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f2cd57-8c52-4361-812c-b8a50abb73b9/nejimovoletodadonofebabex.pdfIn PDF document text
    • http://mawokale.myartsonline.com/nivasigenuladanose.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_a16676fa657e44a9acb27a61351f4c85.pdf?index=trueIn PDF document text
    • http://bamonoxo.onlinewebshop.net/xobafewivefesetozufip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235cb5dd-9614-4eb3-8700-8cd525740ca7/pelton_and_crane_autoclave_cleaning_instructions.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_587fce564ac3468795391baa5f34430a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4a3402-98b9-4dd4-ad09-e15202a08d17/89807116693.pdfIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_9b29fb55a0fa40d887c2481944c3b072.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_19396ee5fd7348f79f35ad53c5b4c038.pdf?index=trueIn 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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 5576 bytes
SHA-256: ebba68da739366a57f67773812e5977341661022194df8ab698b448bcc801c88
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 10304 bytes
SHA-256: 472cc58a97c4b6b1fc421db89332c555cf2f582c805ff4492ce860ada957eebe

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