Malicious PDF — malware analysis report

Static analysis result for SHA-256 54199785fa2e6fc8…

MALICIOUS

PDF

74.0 KB Created: 2021-04-29 01:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd86c4cc24032b230c305cec81bff83b SHA-1: 72e9f7e49bf4cded15243b102bcf3f4bd91e9a83 SHA-256: 54199785fa2e6fc832da90ba09926a51727dd563affb00dec2d4bf89641a074c
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 0.9998

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://fokemale.ru/strik?utm_term=black+and+decker+gh3000+automatic+feed+spool+problems PDF link annotation
    • https://cdn.sqhk.co/zepigelona/jgjjgh2/ev_charger_types_australia.pdfIn PDF document text
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/572661.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/i0gcQ3K/83150879924.pdfIn PDF document text
    • http://desokore.medianewsonline.com/vi_editor_commands_in_linux_with_examples.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/db0931.pdfIn PDF document text
    • http://putoseba.iblogger.org/58721650744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_5fe52993acbef.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/the_ripple_effect_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/fs91Rih/hero_xpulse_200_review_malayalam.pdfIn PDF document text
    • http://gutufozif.iblogger.org/can_you_take_the_asvab_online_at_home.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5ff59b1ce24de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_6037f55c70f45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2a4b91160dfc474e9ac7602bd89977c6.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_92a2ea324e5144deb7adc5c23cf6dfe6.pdf?index=trueIn PDF document text
    • http://vedirananu.epizy.com/aws_certified_solutions_architect_study_guide_associate.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_563d6ff1ddac46a3bd5c6a8f02ebabae.pdf?index=trueIn PDF document text
    • http://miwewugewu.atwebpages.com/linux_search_for_files.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 6128 bytes
SHA-256: f3878d74c7375c7f5e2b51ceee234ac75a248237d30eb417e63562075ea3394a
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 9988 bytes
SHA-256: d2b5ee68f782736939e4bb8aeb6994ef47a6378ca93e4f0c33d3b28f05e5b55d

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