Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26facb167d53c80…

MALICIOUS

PDF

117.3 KB Created: 2021-04-02 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee38c9541dca886abe44642bd3d7a713 SHA-1: 90c7d082294011df6415df36b1e2279bd244a7f9 SHA-256: f26facb167d53c80ccb3f8c45903ec98bf596c722e4c55154cf5d81a2304d2c1
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://leonvi.ru/strik?utm_term=cinderella+story+book+in+hindi+pdf PDF link annotation
    • https://cdn.sqhk.co/xuwifoviwalo/dMxEmha/24_hour_food_downtown_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/icghzp5/herobrine_monster_school_mod_for_minecraft_pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5fd64446e2458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_602b43b488950.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/is_learning_python_useful_for_finance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fef7eabe1c1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5feb97adba45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_60226dae0abb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c5a0c4c91.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Rhhjbji/vosuxuvejewofepilo.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_6e2a8940152f4adcb32f8ce4f3907c06.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_1136b1d052914002b348403e98a78ccc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98be3110-93e3-4b37-841d-e89787ee7bd0/how_to_update_xbox_360_controller_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0534b56c-e77d-48eb-a72a-fbb8762c50bd/sum_of_interior_angles_of_quadrilaterals_worksheet.pdfIn PDF document text
    • http://wofavum.myartsonline.com/29685950311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228627e0-a349-4cb2-9a51-6b6c3684e1f1/gemet.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_6d90c4bbc33341558eb21ebcbd19c49d.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_d837ab487b534f4a9475f67343125fcd.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_55d374ea3033479495f23ab0a0e8918c.pdf?index=trueIn 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
stream_005_off00019874.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19874 15228 bytes
SHA-256: fc739046676769e4e668aea66d8cceeae6f718d00fa5a8e362538b4c0086606f
font_00_sfnt_off0001610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610F 5340 bytes
SHA-256: d47dd441002756fce7cc6e7c9f01555fa10a9a232b4a4ce54637a04a92d4a91d
font_01_sfnt_off0001732e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732E 10828 bytes
SHA-256: a1d445ad65482fa3089e1bff184714173b136e9173e41202f26ee342f236a9f4

Open this report in the interactive analyzer, or submit your own file for analysis.