Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c479a18f8f5ae0…

MALICIOUS

PDF

73.5 KB Created: 2021-02-15 00:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a44d092ac310f68847c16961b0e93e71 SHA-1: 203eedd2298e74b6e594555779f86f5aa915d41f SHA-256: e1c479a18f8f5ae0700575154af4c8f56b304e8fd89811df8c9a1c20c2a9a0c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=latest+worship+songs+2018+free PDF link annotation
    • https://cdn.sqhk.co/wupofolizaj/hPe7oFS/girl_halloween_costumes_ideas_diy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fc7f315a5e56.pdfIn PDF document text
    • http://tulotipokumubo.iblogger.org/android_x86_virtualbox_connect_to_internet.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/82140312998.pdfIn PDF document text
    • http://zefabafiw.22web.org/gujivutinaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fe75dd9a2ce9.pdfIn PDF document text
    • http://zoxifowivo.iblogger.org/takafuxekitajafimamav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fc70f4b93e6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_60051cdcb3e1b.pdfIn PDF document text
    • http://parubexe.iblogger.org/dasekekalikijozezozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betupaxomivokab.epizy.com/jodewovanoxafumosepoze.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/64126289003.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/tunnelbear_vpn_unlimited_data_apk.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/inquest_reports_ireland.pdfIn PDF document text
    • http://zubeleboju.epizy.com/81152788126.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/happy_wheels_games_free_full_version.pdfIn PDF document text
    • http://zekumom.epizy.com/work_breakdown_structure_template_software_development.pdfIn PDF document text
    • http://jijawidifopaw.epizy.com/school_2015_episode_11.pdfIn PDF document text
    • http://fejasafevavo.epizy.com/space_jam_soundtrack_zip.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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 5684 bytes
SHA-256: 6b552b46108a9de3b143b9af695d184ba2aa05ac635c7d1d37fa56cb8846e848
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 10712 bytes
SHA-256: d174237a2c504aeb1a8eb0f7797ec0995dc80773c5ab0ebcc1f9e636a335c9b6

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