Malicious PDF — malware analysis report

Static analysis result for SHA-256 145c5b9af00079e3…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 03:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a80a79a9f979dbae5885e5ae490019ed SHA-1: de86aee865d42de8e79dc003a17a1bee96708029 SHA-256: 145c5b9af00079e3d2d572c609fe14aa24de8d6485ebc7c8847f34d3f64eaa83
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://dafemum.ru/123?utm_term=4000+essential+english+words+pdf++free PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/hp_officejet_4630_e-all-in-one_printer_ink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_60034cd88be81.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/xefesodemoloponupiper.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/idhhwja/94474941563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_60361315e5b81.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/10994472540.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/idQLfUD/86560285831.pdfIn PDF document text
    • http://sberbank.services/pababexidi2kd71.pdfIn PDF document text
    • http://good-production18.site/fundamentos_limnologia5aecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_600b048cf4152.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/object_oriented_system_analysis_and_design_notes.pdfIn PDF document text
    • http://scarcebook.com/pakudavesivakiwufa97ajl.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/jj9d0gj/furimosonulixar.pdfIn PDF document text
    • http://gmetry.online/nanostation_m2_unifi_firmware5biej.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/gdibJih/state_park_camping_in_florida.pdfIn PDF document text
    • http://kersita.space/tv_ratings_for_nfl_game_tonightu1i5u.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/lirumomupinijurekimelitub.pdfIn PDF document text
    • http://freshka.fun/make_it_stick_the_science_of_successful_learning_chapter_2_summaryehjcu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_61b366cef4004680ab890b6e2fc0757d.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_804bf57986094cd898eb967bb0419ec7.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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5528 bytes
SHA-256: 422a89df9e3bdc1d0f2e380d65b7ba303a71a19e68063c5903451267f437a942
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 13204 bytes
SHA-256: 254bc4746a328dc6f080511e4984d7f62fd9971411bd812ecf3ba6dab119919e

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