Malicious PDF — malware analysis report

Static analysis result for SHA-256 884beedbc47e7380…

MALICIOUS

PDF

74.6 KB Created: 2021-06-02 22:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6447facac387f0ec507202fad060282c SHA-1: e9c90e56065ef72e1978759943b01d4437e985c2 SHA-256: 884beedbc47e7380b64aa3bfc7bfdc6137dd0a00a3f766fb7c4afd94baca9198
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'medvor.ru', suggesting a phishing or malware distribution lure disguised as academic content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+do+an+appendix+in+harvard+style PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448103/normal_6040634be6637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_6034f12c9b24e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_60692e9b2547f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5ff6242df1dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_604cc15c26174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5ff8a7d404b6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5fc5dff3ec51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_600cf010ae917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_6066e6c4e33bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601d22729ddfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_601c86429963d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/f/bodozaxod.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144492024/miles_morales_spider_man_comic_free_download.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144460890/85674600594.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/gentle_c-section_birth_plan_template.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413319/52491265280.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426630/22785686600.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/unconventional_machining_process_mcq_download.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416652/bexulixubevivofep.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/gukepikurubumuwimig.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/the_perks_of_being_a_wallflower_movie_free.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144462285/55260346904.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5328 bytes
SHA-256: 15ce0c40373ce9010768cbb67928652e3ede6c349757c4992b9e5fefe30679c4
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 11020 bytes
SHA-256: 1655f4fa5764e6e6dbaeee322b02d5a6b673f70a36c79a352403c30907e6b722

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