Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebb1bf7e60abf11…

MALICIOUS

PDF

67.3 KB Created: 2021-03-22 11:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93f299ea7f7b9986f6409aa2476b1520 SHA-1: 101c05b7ad2cf88201c08094c6db9bc334adebba SHA-256: aebb1bf7e60abf11d6675c137d673428f70a26cd0346d0e2230a85b570d7642b
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://fokemale.ru/wix?keyword=entre+mundos+workbook+answers PDF link annotation
    • http://sumapewub.getenjoyment.net/pimuvuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_602d02f513b93.pdfIn PDF document text
    • http://center-san.ru/nugoretulxkqj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_6057d94555034.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/sebeloxexelapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_600db1f072628.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/augustan_age.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/sajefejewux.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/bangladesh_government_calendar_2020_download.pdfIn PDF document text
    • http://psyhologrzn.ru/8535629921762q0d.pdfIn PDF document text
    • http://baugroup.info/rock_slope_stability_analysis_giani58lrw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/piwoxex.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/xujikaxizafebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d608277-c11c-4ce6-be95-d8aa35f8f40d/1999_polaris_xplorer_400_4x4_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/nonilaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa2b02b-a385-47af-abfa-85eb495ac68d/the_wind_in_the_willows_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/zenonia_5_equipment_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5ea106-ec11-4e25-ae50-2621fab36b31/wufabemimovitiwasexuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/nimujowarew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6429fbc7-d718-45c0-9c98-c68af9fb59d4/realtek_hd_audio_manager_headphones_with_mic.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_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 5192 bytes
SHA-256: 09172bf3a7ee5a2fa4ee3b2a7c56cd4d32de4e6129243d3d4b2b3becc4fc4c0f
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10620 bytes
SHA-256: dc4a4177c4ab49332838fa1a7060d6f7e1f57bea99965d4318e48b61298bb5bc

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