Malicious PDF — malware analysis report

Static analysis result for SHA-256 935475bcc2dfb047…

MALICIOUS

PDF

84.0 KB Created: 2021-04-20 21:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 908fb284a22a31025c253e2f21dd0d3b SHA-1: 75859fb6bc677a9de0bd516fd74cdec94ca6a273 SHA-256: 935475bcc2dfb047e48d603a6e6bb83a1bfb7a1daab8c4edec2763c8455fb292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=what+age+group+is+diary+of+a+wimpy+kid+books+for PDF link annotation
    • http://mon-cmso.best/60991892536mg30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_602e5c4ccd9e8.pdfIn PDF document text
    • http://item-mask.top/dykes_to_watch_out_for_comic0t90j.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/jjjddhj/87032909768.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuvipejo/xjeTvG3/google_maps_street_view_aktivieren_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_60038125c9a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fdebb353b90d.pdfIn PDF document text
    • http://wwbook.org/suzuki_cello_book_2tato7.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/hYG7aih/best_costumes_for_oliver_s_veg_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/BPigid1/visudo.pdfIn PDF document text
    • http://lerob.info/how_do_you_reset_a_hisense_tvczm86.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/musokejixami/how_to_pick_a_master_lock_with_a_lock_pick_set.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/mugadevari.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/checkered_ninja_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/tipemaji.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/fubuxokusize.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_57579ccb55934d958f5a9a6934eda864.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/modumewabek.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/orange_skull_pill_report.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_a8451739d4bf4971aaf2ef2349a9df87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/how_to_reset_avital_4103_remote_starter.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8f1010b2cd804075a27e7ed60234165f.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_5182dc6fd6044000ac2cd1b0947cd180.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_f102f07f4d0d4084a2cadad386baa359.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5832 bytes
SHA-256: 99c84a6c9a22db1536c6b04ebe7327846592d49af7ef874ebc7683a39e4b3762
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 11824 bytes
SHA-256: 3f0aefe99bf0a8dae07df7aebff6f8fc2a0f80a53fe284b44854eed77a4acdbe

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