Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5364a9f4cc1eee1…

MALICIOUS

PDF

101.0 KB Created: 2021-03-09 14:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7b64202b328ce8b1c2292d7aa579d6f SHA-1: 5c5f4366bdfe998feca42559a94bf042f578b053 SHA-256: b5364a9f4cc1eee1d2d3317b617d9eaf1a74f10f28d29af0a7681fb9ecdd2984
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 0.9997

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://pelibifir.ru/wix?keyword=rey+auditory+verbal+learning+test+a+handbook+pdf PDF link annotation
    • https://cdn.sqhk.co/lopumilekana/gfjjczN/lupaperije.pdfIn PDF document text
    • http://reduslim-buy.site/washington_state_covid_numbersievqk.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/how_electronic_fuel_injection_system_worksa91km.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/gsidjfC/vigunewinusixopuxerogufup.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/jakCflB/leadership_skills_in_nursing_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/yEgeiZF/33650781181.pdfIn PDF document text
    • http://cg-designer.xyz/resojibepugovapufixek3v4al.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/6wiahja/rilafekigu.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/b3bb45bb-f4c3-4a11-bd06-ca9f064d972c/how_many_forms_in_yang_tai_chi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1db451d-df62-4166-b104-3c6a98d3d92d/router_g1100_vs_g3100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7a2422-68ab-43e7-ae17-9988d30a0720/bofugipelidivebamutewon.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/dagufatifuvodiboruvosad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388ae079-f952-481d-a024-f533ed4cb9d8/harry_potter_plot_half_blood_prince.pdfIn PDF document text
    • http://lasemiduje.rf.gd/pigitivinonewip.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/laudate_dominum_mozart_sheet_music_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a809d1f-3c19-47cf-9d42-2cb4edf797ee/wifipozalovij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2a118d-0ebd-4829-a7d8-7ba29de94002/77370688747.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/plantronics_backbeat_pro_2_replacement_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e72a6c5-d0da-4910-850e-fe219b9ab6c8/zujakipowikeluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908e5b27-80ef-46c1-a61a-b9dbc779d14a/epson_wf_2630_cartridge_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/69453803248.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_off00014a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2A 5676 bytes
SHA-256: 2170b36f31a9ee70792d3bf0ba4a02d16892e4e2e9285801cf5eadc53eae1e0e
font_01_sfnt_off00015d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D90 12640 bytes
SHA-256: f34f7b5c55117d056325df575bb08c2b0067d2dc927ac3291b4a92410f9dbe76

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