Malicious PDF — malware analysis report

Static analysis result for SHA-256 693b384e14d062c6…

MALICIOUS

PDF

75.3 KB Created: 2021-03-12 18:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e31887a2c6b20c855c2f7d65306522fa SHA-1: 54f95e5ff4dce5fd899347fca2564f2cb792a731 SHA-256: 693b384e14d062c6eb304dc30bfcb1d53a2e1a5a761ca67e799340a300d10b10
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+thread+a+montgomery+ward+sewing+machine PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/what_is_the_peter_principle_in_psychology.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/zaxozeliz.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/Tpha1hd/osprey_complete_retro_plastic_mini_cruiser_skateboard.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/63023957252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_604ab7695dd7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fc93db254ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_601d959e90761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ffc7bc45a06f.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/ajaU2Bg/daily_maintenance_checklist_excel.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/314b74d6-dde7-4aea-926f-5125a561879e/how_to_address_a_letter_to_the_board_of_selectmen.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_352b2abb600b414992d0ebb24cd96a93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/80243076183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b9b1b8-8b89-4b88-9b97-8dd4c0dc945d/ferrari_812_superfast_engine.pdfIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_fc0fee38e1624150b259306362b33e78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/the_highwaymen_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/64730761199.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5476 bytes
SHA-256: 0af44742b8629294daaef7fdde50639088bdb2bdefc903f90eb4906fd8212685
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10760 bytes
SHA-256: ee152adc973c032b30019a3c0f4e3dfcd3c0439cdb72957f82b4bd60304abc90

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