Malicious PDF — malware analysis report

Static analysis result for SHA-256 21067d55b180a26d…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 07:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b4cf5342213dfa5563b124907ccbacd4 SHA-1: 55ba1376ba136984dd5791b12a0ffb8cc28660ba SHA-256: 21067d55b180a26d5f623cb22f37550f5836ea939b269f2e8f8e72c9a61f536e
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-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://botokaw.ru/award?keyword=brushless+dc+motor+working+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392474/normal_601c7e494b6c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd8985d32941.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/detonazorelavexumebi.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/2sjhbgd/zamofijasuzepojonovuxopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_6026c3aad5b35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419194/normal_5fe4f7d6212c1.pdfIn PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/lovalitimowimumal.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/4510176.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/jjgeDhj/real_supreme_airpods_case.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602097f4369ab.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/0c83d95ad03c9.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/ripomezomod-dijakuxoriruge-lapewi.pdfIn PDF document text
    • http://www.fotoliaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/855a8ddb-d472-4f40-a918-7cc42f2a7287/voridemomalitu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/2906882812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739f0d99-c1fd-402e-b332-6b0e0d95e1d7/nail_salon_open_at_8am_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7ae9a3-bb6a-434f-8a7a-b40c1ea178fd/the_body_reset_diet_cookbook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/file_folder_tab_template_illustrator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 5444 bytes
SHA-256: 1bc69f4a98f80ad8ea90cfec41e975be72255ce804084c44a0dbe73b829b40f0
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10892 bytes
SHA-256: d9be02c14b5e25353b5df73ac8dbdb21b9705504af1fcc66ba0acc5fe3c0acb0
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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