Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b8939c7f9b700a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 20:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9a33e4d5656a959fc31a2eee411e6f8 SHA-1: 86a2519ea7adb14feecabc6b69309d59c843d508 SHA-256: b6b8939c7f9b700a18e61cf66ac557252d832f0cb7f23439c1ba9cf013d7c251
126 Risk Score

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 0.9991

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://baarspo.ru/strik?utm_term=apple+airport+express+setup+guide PDF link annotation
    • http://tufuwavaziga.mygamesonline.org/borrowing_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_5fd9ce768755e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_600f7940e67bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383928/normal_5ff037bfccb11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fe9b6b607c96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5fcb9fd0a3f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_60353e0f264cb.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/diode_and_zener_diode.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/how_much_does_industrial_pipe_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fdf7cce1ed62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_6022c25ecdbd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_6052c9de9e5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_6037aece37723.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/importance_of_teaching_critical_thinking_skills_in_the_classroom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5ff1ca6bef509.pdfIn PDF document text
    • http://pupunorip.getenjoyment.net/76206486780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ff9338f1cbe4.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/mexunademigurejufaxelotiv.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/difference_between_central_route_and_peripheral_route.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/dulegixitejoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/997923b7-7e5a-4394-9c41-6e7abfbd305a/37944496986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f418c3-06ad-45ab-acb6-91a0b9d5db9f/670341097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf04ee1b-8a18-4399-abd0-fe2d9aafd430/87050437469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd3f1d9-592b-4166-a392-9cc1542eb291/mubekoli.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/benchmarking_espaol.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 5184 bytes
SHA-256: 8122b89696d957f52f3f34cee23d517ff50370ee9e8fcb8b39be8ebf74d18c18
font_01_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 11272 bytes
SHA-256: 0f31c64ed4de68c9ed8419c3c1083762a2f0409c1ed6bf86f373c0e1627b6862