Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e6b57f1ccad99f…

MALICIOUS

PDF

68.7 KB Created: 2021-04-05 11:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1d7c832490db1cb4940061e40fa13f24 SHA-1: ba5b2e654317ed24aa0098f2e67c38677b67c5e0 SHA-256: 08e6b57f1ccad99fa1a057683fab802bb045151c727ae81d47e94d62bc8b7f66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with the primary lure being 'Chapter 9 drivers ed answers'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external link behavior strongly suggest it's designed to redirect users to malicious websites for further exploitation or phishing.

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://golowaki.ru/wix?keyword=chapter+9+drivers+ed+answers PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/fGJjbju/sepufaxejomusojimek.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/i1Xhdwv/gaziva.pdfIn PDF document text
    • http://ergors.space/vintage_kenmore_sewing_machine_manualudg5p.pdfIn PDF document text
    • http://stroy-level.ru/adding_integers_worksheets_grade_7afknw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fe36d2fdcb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_603370e50c30b.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/qjaNLgf/faith_family_church_victoria_media.pdfIn PDF document text
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/bazujesifodolij.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/attached_amir_levine_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_603768cc86ba9.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/236d6c8e96e3.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/sisajijb8oha.pdfIn PDF document text
    • http://fsfsfd.xyz/xikujizuxexk5r2d.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/gifGgfL/walmart_grocery_coupon_codes_for_existing_customers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telosizaba.onlinewebshop.net/honda_world_louisville_express_service_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/kakamega_county_map.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/13241508681.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/oreck_air_cleaner_parts.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_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 5228 bytes
SHA-256: a3efce5a32f575b041ecd78c6253792be64acb7d2465875959c5bf4d3abbca42
font_01_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 10336 bytes
SHA-256: 4ca18cea2b32376b9e2559a118824177ac9ac0e46fdb6f9d3af5cba0ad9b00ee

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