Malicious PDF — malware analysis report

Static analysis result for SHA-256 98600db41ae16468…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 11:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dfc9286e0bf694b3330681b59f1665c9 SHA-1: 60111ebff7e067c7e4c0e76e49d2767146b03a1a SHA-256: 98600db41ae16468d12aea7258c05331fa990124ab58cb9d97a7fde7cdf557d0
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://ponafet.ru/123?utm_term=cape+mob+unit+1+past+paper+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451220/normal_6064e8c6dbb7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64c11e620a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_6023d24b574d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601b44838a870.pdfIn PDF document text
    • http://zoompol.xyz/cicala_e_formica_disegni_da_colorare1k2un.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/why_does_my_epson_printer_not_recognize_ink.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fe83e1e9699e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_604832163f976.pdfIn PDF document text
    • http://neojust.ru/industrial_safety_signs_and_symbols_free_downloadaoviy.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/what_is_iso_9001_lead_auditor_certification6fbfk.pdfIn PDF document text
    • http://talemine.getenjoyment.net/minecraft_enchanting_table_max_bookshelf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_60103f05997e0.pdfIn PDF document text
    • http://mscredit.info/38951734271xi0zw.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/d5dd4b87-57c9-40be-b2c1-2b710ce2f037/38928937305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e1f89e-6113-41d4-ab0d-494a5b84b48a/95294846260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9090aaf-a9cc-4ada-92c3-52d066f1d971/www_garmin_com_kenwood_dnx5120_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5740f527-d38f-4766-b0c7-6ede62bf8740/what_is_spiritism_allan_kardec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759e6189-558b-4124-95f0-c47051a55496/who_is_project_zorgo_in_real_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c80792-b405-44b5-a7ab-5a40f18eed11/12617066808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc2d467-a0a6-4d80-8fb4-3d1975e26e33/ap_psychology_review_sheet.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_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 5120 bytes
SHA-256: 24cb887fcf2868610633da8b38dcf727682a8b3e94787bab4050d8337c0198af
font_01_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 14476 bytes
SHA-256: b6a326420d580347d4fd1219b29886afc62cad744bb71e88ac499f0512586743

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