Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7707d561848c7e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 07:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30790b7aaaffcbacf5f02e3806230cc6 SHA-1: 5d2d675aa4d8ca508030fe4e047b882d0b8697a5 SHA-256: 6c7707d561848c7e9ee9fd58cc65e543b246b3d2bf2426238074197cfee71f45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=george+washington+dollar+coin+2007+p PDF link annotation
    • http://ital-girl.space/xiwemadubavemuwowuwoxipulc4vrn.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/En3hggh/total_conquest_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fd662ea6b72c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5ff9a3d8ec109.pdfIn PDF document text
    • http://tcerkovniekupola.space/46934747929dpa98.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/iCXhiQz/outer_space_bowling_balls.pdfIn PDF document text
    • http://quinzsy-studio.design/36448073161qo0l2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_5fd825593b7b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_60471377c0af4.pdfIn PDF document text
    • http://soldonlittleton.com/32814477298lr2tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_604a3a5423402.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/BxihXij/35418564449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_601f145ed6abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_60130abedd9fd.pdfIn PDF document text
    • http://avto-document.site/8616496147497xt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_604f36ea6e6b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokokimalofov.rf.gd/is_web_api_rest_or_soap.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/renutisevodaremaruzopa.pdfIn PDF document text
    • http://favigawesuwevo.rf.gd/anemia_drepanocitica_en_pediatria.pdfIn PDF document text
    • http://wujipimasedol.epizy.com/bcs_business_analysis_foundation.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/20472811194.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/6173692722.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_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 5812 bytes
SHA-256: dc3397cac3f9181e4123351a6e9b06fa61ecd252d28c6564f94a1c1c8545979d
font_01_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 11044 bytes
SHA-256: 60a2e3cf5ce7c5fe597190eeec953762c56f2863672e9f66edcc5b828b2b9e3f

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