Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6874ee32341e588…

MALICIOUS

PDF

99.0 KB Created: 2021-04-05 03:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68d740301edbb8a1a83a3308386c9b0c SHA-1: c295b02c147e41a6d7f9cef7c847ac52afc778f1 SHA-256: c6874ee32341e588f9a705565e0f93bfe21bd518fd193bda5456086e2bcc1db7
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://gimoguvi.ru/award?keyword=auxin+journal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387825/normal_6053f08c2baf8.pdfIn PDF document text
    • http://wexypay.icu/lopatodojufogefeporuwujanvqzum.pdfIn PDF document text
    • http://grafoanaliz.ru/ginenulivopofituziwezidugjwcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_601f0508f02c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_601d8c75274db.pdfIn PDF document text
    • http://itash.space/automatic_car_wash_business_plannc7b5.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/rikatajakepil_sawivapaxija_wupulexusife.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60018ec7db149.pdfIn PDF document text
    • http://natusab.22web.org/memokijopufojise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_60315571b5c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_5fdafcfe22427.pdfIn PDF document text
    • http://alcozerox.com/952003765010cp4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fdc2ec5350a2.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/6747049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomogas/evaluating_expressions_practice_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/60467417030.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/89491538078.pdfIn PDF document text
    • http://kaxegukepoxar.rf.gd/capacitive_voltage_transformer_in_substation.pdfIn PDF document text
    • http://wiwawilif.epizy.com/sig_sauer_p938_leather_paddle_holster.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/94908995764.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/lupejilulal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/manual_ft-897d_portugus.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_off000148b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 4992 bytes
SHA-256: db1fcf4fa386b0d07c272ba9b2987b75b54fdc6a2a9c8ffe2b3fc79703b523fc
font_01_sfnt_off000159ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CE 10860 bytes
SHA-256: 160bc64ad2dd44a483f6daeba51ce02f4b1490958d23a94e8a2bbd3a940d5313

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