Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cc8cd8995ef9fe…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 05:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0a95e88f05a45ea1c5872a981c5819eb SHA-1: 40860516db25ebdccb6f8bffce4574e9684ace33 SHA-256: f9cc8cd8995ef9fe4d5a0037fa2228840e3e03614c6f86012f7b850f97be8eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The embedded URL https://medvor.ru/pbw?utm_term=dorian+yates+blood+and+guts+chest+workout is likely the primary lure, directing users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://medvor.ru/pbw?utm_term=dorian+yates+blood+and+guts+chest+workout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454965/normal_600eb208e32a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6030fb2c14f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffd9dc6a1a41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_6002aea23ea65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_60119a58bf5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_6023010e15780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5ff2bac3c3006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375357/normal_5ffeb0f5aa7b0.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/58c2fd4d-1be1-43af-ba77-8721026254a2/karisujakir.pdfIn PDF document text
    • http://berilizi.pbworks.com/w/file/fetch/144823482/58806411726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128e5d16-04c1-43d6-8f43-8669520fce7e/91325221379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4a3272-322e-41d8-aab1-ee60ce693832/would_you_rather_questions_dirty_and_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465744ef-366b-48a2-8bd8-343bb926d040/astrology_for_beginners_and_hindu_predictive_astrology_by_dr._bv_raman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d752b7e-2354-43f7-8028-d7f645399f0e/2876630617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d0d990-2df6-4f76-9779-084e6233fc0a/nujorofapibanumukudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c77ceb7-c479-4258-b644-2ce59d7bddd7/xabuvefotatesilofatuvoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d97cc0-a7c2-49fc-bf7b-a7215d1f9702/use_ps4_controller_with_remote_play_ipad.pdfIn PDF document text
    • http://guwodav.pbworks.com/w/file/fetch/144743754/kefiduzolim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2956eba5-73d0-41e6-9eeb-064f93d3e790/alimentos_que_no_tem_carboidratos.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144564303/38456614616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3806989-6772-47e8-8f18-198e90df7696/how_to_write_a_visual_analysis_paper.pdfIn PDF document text
    • http://sonubugu.pbworks.com/w/file/fetch/144639252/where_is_the_carburetor_located_on_a_troy_bilt_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12041410-0fca-49cd-a3bf-e76fc8458590/27130332776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514c6010-4ca8-43cc-be72-0ca84492b8f7/algorithmic_trading_and_dma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4ebb6e-aabf-408e-bb75-fb8100fc3096/gifikobodawotuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4880c784-7ffe-433b-a9d0-2b39f2f4936e/taming_of_the_shrew_act_1_scene_1_quotes.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144497616/risk_assessment_matrix_example.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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 5600 bytes
SHA-256: 755ba19095677d80cd0d8e40295ed75727eedd05aab66476e459f61c8a348ef7
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 11196 bytes
SHA-256: eb752ae284a9a7995c3b1f5c206f23e3763c03c664090e8e59ff5ebf04b17bdc