Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1266090d3b5b87…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 09:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecae8b5b89d0465d4372c2f548c53bc7 SHA-1: 5ddd55a1149d4bff1a21cffb99d9e1dd5120a023 SHA-256: 6d1266090d3b5b871eee08f9706edacefa2ba3d8db96262324f10c60ba6d8b97
186 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. 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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=ocr+arabic+pdf+to+word+download PDF link annotation
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/kewujufobewevilex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_604ff099ba36b.pdfIn PDF document text
    • https://kajimawujejava.weebly.com/uploads/1/3/5/3/135348493/e16556d2e1871.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/igewihd/lokopur.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/3089667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464861/normal_5fef7ecc2c97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_602dcc150c6d9.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/2233447.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/sixagegoxuwiv_zufufejo_ropib_konuxero.pdfIn PDF document text
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/ronab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_602ce36d961c7.pdfIn PDF document text
    • https://cdn.sqhk.co/xafazunusa/dqFlPvZ/real_ragdoll_battle_guts.pdfIn PDF document text
    • https://ralevenewuw.weebly.com/uploads/1/3/4/4/134464099/satapelezuzafe.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/8053d05a58c5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd2f19005d4c.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/70d19ea652a435.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/046c1f01a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6052ef24d3ce5.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/16bea426-466b-4f34-9df9-1e83cb1a667f/theories_of_entrepreneurship_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47e53e3-7a93-4717-a4ab-25fd409cd413/niv_life_application_study_bible_thumb_indexed_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46fec6f-0ab1-4753-882f-e7440b8549ca/what_are_the_purposes_of_social_science_in_our_daily_lives.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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5228 bytes
SHA-256: f8193ca74c083ef2072aca0bc564ae5e9019c96791f7e9904a8d1a3834fd1ed2
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 11432 bytes
SHA-256: 86116df35e995d2bd4f4e165517a2dcc38372474ee4cb9d7e6114ef17e68ad8f

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