Malicious PDF — malware analysis report

Static analysis result for SHA-256 474bc7448d020ae1…

MALICIOUS

PDF

74.0 KB Created: 2021-02-28 23:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d1f42781d33e806cb41779f8199c2ca SHA-1: aaf590ee315c639ae4791919e28568e22a41c67b SHA-256: 474bc7448d020ae15adbbb1dd1efa447388a19514cd5b0b44b8bdeb9780abbfd
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://nipisod.ru/strik?utm_term=what%2527s+an+example+of+allusion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5ff30e646f576.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/autocad_3d_building_dwg_download.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/35955712905.pdfIn PDF document text
    • http://womenit.space/the_narrative_of_the_life_of_frederick_douglass_an_american_slave4xue1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_5fe756441541d.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/XBTgihg/newivir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f831e5769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_600bf44452dfe.pdfIn PDF document text
    • http://orbitan.fun/convoking_wand_guidedkpjt.pdfIn PDF document text
    • http://reactivascotia2020.com/lab_report_format_example_college97r7r.pdfIn PDF document text
    • http://sadovik.me/nokizufefepubibesikwnaah.pdfIn PDF document text
    • http://zatoboyvibor.fun/57732403942i0rbv.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/zowejunef/dagshai_weather_report.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/inspire_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/resiregefojizorukixope.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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5160 bytes
SHA-256: 2b58545c7fb4d0021d5cf4da1fcc9e7539aaa79fa18a91a9df63047cc8beaac3
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10612 bytes
SHA-256: 25817041c07f642b9034d947381d957bc626ceb85abde4fc6b9ca87e68abb96b

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