Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03ea11abd037f62…

MALICIOUS

PDF

76.0 KB Created: 2021-06-02 06:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9e0e0a111d702891a9f387c1fb17c6be SHA-1: 5a9411d34d850ab06981c832be0fa1a41f76004b SHA-256: d03ea11abd037f62c2ef18285a5851b582fad8bba00e4060cfa02a1f9b7fde2f
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/pbw?utm_term=free+crack+coreldraw+x7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489725/normal_60247074af9c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_600744bab91ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6052159491c60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fd07a099d042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_6019a21592aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601b2a9079c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fe20f8775e22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/f/kidapewewovemisanawuxan.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144466857/megenogibodofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6175685a-e472-4ce4-bb27-4457edc77966/49042943063.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144423009/how_to_reset_summer_cadet_baby_monitor.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/vishnu_sahasranamam_names_list_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30246f56-0fcd-4b53-bdf5-3377e6b08f72/83420291505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4994700d-f721-42f9-a051-a66a6b2fb00d/19540894748.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144425997/busesowidupuvelapus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5426ed-8c13-47f0-a835-faff85d6caa0/80075888163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a5b3d5-24b3-4257-9cfd-c29e43d5c3b9/emil_and_the_detectives_1964_full_movie.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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 5012 bytes
SHA-256: cb122b11447baf0b816738c66525e0508dda8c1a2ddc5969e69f0d1b6cdff6dd
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10960 bytes
SHA-256: 51ed912aa0fdd554c984826a7a82b3cd85ef68128bddf914a40f094d7eb4e216

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