Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29625db293e70f6…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 21:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55f9f0da06f2151e66fb460741b81b69 SHA-1: e0f34fe7dadc25bf4f99a60955c278caddb1a79a SHA-256: c29625db293e70f67a05c7df25170f44579eaafce50e79f853725a78c7c64089
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 0.9997

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://druttle.ru/wix?keyword=bargaining+for+advantage+richard+shell+pdf+download PDF link annotation
    • http://xofazonir.iblogger.org/game_design_doc_template.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/92790808494.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/lowukazamejolola.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/le_corbusier_five_points_of_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/6eifijr/starting_over_chris_stapleton_album.pdfIn PDF document text
    • https://cdn.sqhk.co/webuposiba/9hgKjjc/rawevarugopezibixo.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/jiggejc/brand_management_intern_job_description.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_60004fb19d0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_601fdd445e7a6.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/50801750468.pdfIn PDF document text
    • http://yesitalia.fun/the_inheritors_william_goldingcfcdd.pdfIn PDF document text
    • http://puwuditufu.22web.org/clases_de_sistemas_de_informacion.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/will_star_wars_have_another_trilogy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegagino.epizy.com/52307792659.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 5620 bytes
SHA-256: 54ba4c45ad1542c21e1bf36342deda1241b255faabfa3d25a85afeb090ebdc5a
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 10376 bytes
SHA-256: 06c3a1efc0aba520243fb02c29948fee3b4af32434c65246f2d8db2cc679e849
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 16100 bytes
SHA-256: 513236b56cd24d18f1916a542380e1656fe596eca6e14df5516133ff488da9f9

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