Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceec942293f95383…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 09:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f51591db4a06456cf807949f55ddb5b9 SHA-1: 7ead011ddd8b6a27cf2f7dfa1655c3513b177fe6 SHA-256: ceec942293f953832498ffe3c9c0d17f323a067a19c6d9355adaf0a9ac41ae45
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a 'CCNA study guide'. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/award?keyword=ccna+200+125+study+guide+pdf+free PDF link annotation
    • https://mugezumaz.weebly.com/uploads/1/3/4/4/134401185/9357691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_60240f9ad89e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_60496cbe85ee8.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/3176187.pdfIn PDF document text
    • https://lomamunapud.weebly.com/uploads/1/3/5/3/135315780/tevifuvoxoreninan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcbf21ce474b.pdfIn PDF document text
    • http://basujenos.22web.org/watuvutolek.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/6332045.pdfIn PDF document text
    • http://juzupujexeta.22web.org/altivar_312_manual_de_programacion.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/7726008.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/f7abea29-7a2c-41f7-9813-3759c0d6c510/jinutojinalotowatuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfec3f24-ec15-4475-a3dd-c06f1ab64223/43779974939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed14ef7f-5c58-4841-8631-f8f68c5e42b5/does_missouri_have_a_cottage_food_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340624ed-d518-4f1c-9e98-ccd97e561b35/what_if_your_microwave_is_not_heating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c04fb5-9365-43cf-bd45-bed51f9e5a9e/how_to_remove_a_stuck_videotape.pdfIn PDF document text
    • http://biziwinajivo.rf.gd/bifurcation_theory_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f75fe2-4457-44c6-9eab-3d2d30d9a6e1/how_to_operate_walmart_cash_register.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0ad3cd-666c-4a1c-a1a5-efda3b77248f/lunazem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdaf204a-bdf1-4a27-8702-e918995bf062/mtd_yardman_lawn_mower_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26948a7f-f3c5-448e-aae7-2e42519ed9db/nebofanesuruvumasuwoweguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c28a1f-a3dd-4b4b-b064-8f1255572b45/how_to_convert_my_evenflo_car_seat_into_booster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e0b678-db0a-4d9e-9c39-1a7624a88cc6/use_tascam_dr_40_as_audio_interface.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 5748 bytes
SHA-256: 7ccb7c15e013f1b08f145e346c3ad1fd9018ef1e69bc3fdc288ffbf1a37afa30
font_02_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 11092 bytes
SHA-256: 91b3ba140c3d147da9467ed7c7a086a777c79305a7255c5e73c706ebeb02f00a

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