Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e82c637efe3e909…

MALICIOUS

PDF

85.9 KB Created: 2021-03-25 00:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45feb0b78cf896303e3254c109cfd147 SHA-1: 5ebabbc92afe7fe2f3a41767a467889c65a178b9 SHA-256: 5e82c637efe3e9092a1b0f9bb7b0d4fb3739402c8e35ea8c2612685fa505cc7a
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://midufefew.ru/strik?utm_term=adobe+photoshop+cc+2020+system+requirements PDF link annotation
    • http://sewawena.scienceontheweb.net/40380540416.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/89346320109.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/pujojigakuladowiwifup.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/jewitutoxixada.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/barron_s_toeic_practice_exams_with_mp3_cd_3rd_edition.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/82152890620.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/history_of_apparel_industry_in_sri_lanka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/675a9ba7-c669-4247-9e17-ce759c204a32/96670621733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d60a4d-b9cb-4bd7-b03b-630ad19d10fc/lokiwaveguzesuzurabikigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8b041a-f41c-4f48-bec0-ada169eba03c/great_thought_meaning_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cb1c8b-7ce9-4218-a19a-f64827ba3a56/99914007317.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/accu_chek_guide_me_lancets.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/whatsapp_plus_apk_v6._50_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/following_directions_worksheet_for_grade_2.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/zopuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3451b8c5-c04b-4764-a6ff-4266e0ad300c/formato_de_mantenimiento_preventivo_y_correctivo_de_vehculos.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/night_shift_merch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016095b2-707b-49b2-8618-fc4137158649/banubamod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56d6d63-d9b2-4a1a-b5d0-d00a44354e60/when_does_school_start_in_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 5584 bytes
SHA-256: d8d1fe51dd790cb1fc0e8564a67bdbf1169a2e1028c80673aaf6bf49568aa346
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10980 bytes
SHA-256: 52cd481959713d02a1cf859d5697459355177508b30138bf2da88f89bc20a477
font_02_sfnt_off00013bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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