Malicious PDF — malware analysis report

Static analysis result for SHA-256 919794f9b0fd3d9b…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 13:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5bcb0f3f0270eec0dc9d6bb0b358a52 SHA-1: e224a4b6c6fdc60a4f68acc77db9b9f3e4862389 SHA-256: 919794f9b0fd3d9b5d4adfaf2f5105b47af97415bd56fb76d1f39b120d6c0670
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 0.9995

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://irlanc.ru/pbw?utm_term=app+store+mario+kart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368989/normal_6041a43119c0b.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/xetepofojerajaverire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_600c2643b4d99.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/5381282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_605c3b990aa50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_600267e5aa1ba.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/d9b736c0a.pdfIn PDF document text
    • https://kuwoloxafi.weebly.com/uploads/1/3/0/8/130873903/bezet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_600504e8b5fc9.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/2564135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcb1b9630110.pdfIn PDF document text
    • https://dewasujule.weebly.com/uploads/1/3/4/3/134340999/gejopebaboz_jetadi.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/5870867.pdfIn PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/kukarunome.pdfIn PDF document text
    • https://vexapezerizerup.weebly.com/uploads/1/3/4/7/134717078/gafakadenobetop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6063cdda41275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd246a1a0de2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ridelox.pbworks.com/f/media_creation_tool_win_10_2004.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/w/file/fetch/144756597/biblical_meaning_of_numbers_1-40.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144744327/sukopo.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144918693/minecraft_pe_1.15_apk_free_download.pdfIn PDF document text
    • http://vazufatar.pbworks.com/f/how_to_put_a_blade_on_a_skill_saw.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 4988 bytes
SHA-256: 7ac84e8de38d36ef89c8faf3127b27547226aeaf4af15a567ff124d068c6326f
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10072 bytes
SHA-256: ebbf9030ad8b8a5b9306dfd2f799166127811a98089c00f0a7c5b03ba143cd22

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