Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd45db3c07cfd4a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-11 12:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be01104fd42a3353cffa219354f11f72 SHA-1: 9eaf803e7836ab124808ca23a86fc4a6bd92005f SHA-256: 4fd45db3c07cfd4a7b2691a51887cf7b0697f264093754c54b272f3740a16ba3
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://mezovuduw.ru/award?keyword=uniaxial+and+biaxial+crystals+pdf PDF link annotation
    • http://galufixagomedo.getenjoyment.net/learn_arabic_online_free_for_beginners_youtube.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/tonadotufoga.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/64594109335.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/xozesesigerururosuvoxu.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/waltz_no_2_violin_sheet_music.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/gowowiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fc7659a62273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_6038faf9d1191.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/how_much_is_procreate_for_ipad_air.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/what_is_martingale_strategy_in_forex.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/performance_evaluation_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roveramo.atwebpages.com/how_to_reset_whirlpool_top_loader_washing_machine.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_4c913b3c30c643e48d603e52d1c6e814.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/598d63b0-7dad-4864-8f23-94fc80d1b7ed/95556593118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a07c5c-021d-44e2-aefe-a6a26315509e/what_is_the_biblical_definition_of_faith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192421ea-f999-4f36-be41-e3573247f4e8/huskee_lawn_mower_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f35e08-c4ce-48f3-8022-b123b453ce9c/rafitobefemo.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_b9f0c084032043d2bc36390a5fe7b165.pdf?index=trueIn PDF document text
    • http://bexukavibume.myartsonline.com/65904145757.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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 5448 bytes
SHA-256: 36fbd7b27fd5ff6859b48110fe0a26d7464cd94768f81200a3b25b1ffa141491
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10748 bytes
SHA-256: b24849bda408379f0a0773980a59d4cb6390f2ad0250e3bb0e07fe2d44fb364c

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