Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e0243eb26cecc8…

MALICIOUS

PDF

78.1 KB Created: 2021-05-06 23:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a06460eedfd91642a917b560fecba492 SHA-1: 52f8bf451970c6dd11117225534ae0c05af22623 SHA-256: b4e0243eb26cecc861a16b6957cb7d12bdab8f7229a58328890d9ca39a4d1942
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=2005+honda+accord+hybrid+owners+manual PDF link annotation
    • http://gadivawiw.sportsontheweb.net/boitekanelo_college_courses.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/best_bodybuilding_program.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/pezeronurirekozumix.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/pdf_books_marketing_management.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/power_pressure_cooker_pot_roast_video.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/Pheihhd/28544098133.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/difM6Ex/440095424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedikoti.epizy.com/design_and_analysis_of_algorithms_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d3c48f-1637-42e5-b040-3e829152a7e1/lejoweva.pdfIn PDF document text
    • http://gipezivav.epizy.com/menumob.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c4203163bfe34873b3831b8986722474.pdf?index=trueIn PDF document text
    • http://dikedelunok.rf.gd/humminbird_helix_5_chirp_sonar_gps_g2_review.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_7e079defdd9b4349ba967116aee5b614.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_71ed7bfb1f874c4c8a564f0b943e7b8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d783af43-bdc3-4b58-bacd-f89380a4f571/is_yoda_a_yaddle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73104243-4192-4017-bf7f-673a29351107/what_does_orthodox_christianity_believe_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fe0bb8-0e65-43de-b66f-686b140dbdf7/how_to_adjust_fossil_gen_5_watch_strap.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_9632bc1e0633401098f797568b5cd351.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_49114d12b832414384cbd9c9a05c9a68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/533abf2f-7c91-47c6-b307-fe56ca3609c4/how_to_find_a_freelance_writing_job.pdfIn PDF document text
    • http://tijoduv.epizy.com/jofusaroditoramov.pdfIn PDF document text
    • http://gaxubamodenev.epizy.com/aphasia_screening_test.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_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5816 bytes
SHA-256: 39bd02d104c0dca8fe44c71e1734935f16e269677c0fb3a1c5ca7cec006e7181
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 11912 bytes
SHA-256: 59aee4c7dd9cce446942fe5b4dc72acff7e389b3471ea2ced90e608768a32514