Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a08dfdcf05c310…

MALICIOUS

PDF

79.0 KB Created: 2021-02-17 08:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6d32462cd5b022fb58c8863b567d18a SHA-1: 7f89ade2d21fc1dab8df53a5d136d0ae125ecbe9 SHA-256: e3a08dfdcf05c310ffad1af7627b5628e1314a01089b366760af10bc398177f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=ancient+greece+art+planning+ks2 PDF link annotation
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/basapakir.pdfIn PDF document text
    • http://mandarins.space/druid_boomkin_guide_3._3._5c2iyb.pdfIn PDF document text
    • http://indonesia2health.online/weather_report_today_live_news7mgxu.pdfIn PDF document text
    • http://bitjoms.xyz/tcp_ip_protocol_suiterrt5c.pdfIn PDF document text
    • http://tiktokhd.design/learning_spark_oreilly_2019acsm6.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/kikozal.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/rilobafulamumalotatukom.pdfIn PDF document text
    • http://presentinsta.site/aerospace_engineering_books_for_beginnersutshr.pdfIn PDF document text
    • http://tehnotop.site/snowboard_master_3d_mod_unlimited_moneyod2po.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/nilititonawafim/86614039523.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/wayfair_platform_bed_twin_xl.pdfIn PDF document text
    • http://xugadizedema.rf.gd/13444992790.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/papebovugipetebawulaka.pdfIn PDF document text
    • http://tukuponuvul.epizy.com/my_little_pony_birthday_invitation_free_template.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/bootstrap_center_form_in_page.pdfIn PDF document text
    • http://gijuvove.epizy.com/mumbai_rains_latest_report.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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5284 bytes
SHA-256: 8328a6984a98b4e24d099f83debc193ef481074b891307509264b2d1cb694467
font_01_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 10868 bytes
SHA-256: 91f03bfd25d9f890c6f91bda39c7d3088e6c74e04711628a0144c285426bffad

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