Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf86b1d662969132…

MALICIOUS

PDF

69.2 KB Created: 2021-06-07 01:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a17915870e37ab87c95dde18be2653b7 SHA-1: a30fdca6b986ac1025f23e31f82473210d2e8702 SHA-256: bf86b1d662969132cb60d74be3bb7149ce7b97933ad1730d7dab3cad064b09f0
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 0.9996

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://cructi.ru/pbw?utm_term=nvidia+geforce+8400m+gt+drivers+for+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5fe622650ebb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_604420c7abc3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fcc60c1971b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_60075f985a03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_6029f5f9a94e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_601bbb28afd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_6023a5b67d285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6033fe1e5450b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144627669/soleil_ceramic_heater_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7dfce9-c4df-4458-8f1a-b1d64a34eb48/how_to_study_for_ca_real_estate_broker_exam.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/ipcc_standards_on_auditing_short_notes.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144751656/54116544295.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/f/48744306082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea4f843-67ac-40d1-b952-7f6902ad173b/how_to_critique_poem.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/26708456432.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144498465/wamovawinu.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/tunixogojikarizus.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/ejercicios_verbo_to_be_negativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae92e51-c476-4adc-a7a3-26264e389588/sunozesirame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24394056-72e8-4af6-bb0d-b6d03e4206d1/16418723327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178f482b-f2ce-466d-8ed8-aa0e3c35d95f/how_to_pass_ascp_mlt_exam.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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 5908 bytes
SHA-256: ab045c567b38048176d593e789e9c89a2ed54d56378d37d3beb7700c4f2f5ee9
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 9828 bytes
SHA-256: a8b80826866f3e4a7ad6aafebe4beb8d1cc0d6a867a0e84b30d9f38e57007cdd

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