Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce04a6315c00e66…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 18:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f7b9a0f3afa96ae2736d60c1b72be5b SHA-1: aed8171c4659ae131bb959ec06281566283e0c38 SHA-256: 4ce04a6315c00e66cf8ce9413b86018b4df8310713ebcd3804a5da596f9c9f45
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign-looking PDF files, but one critical link leads to a suspicious domain (vilenefex.ru). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=automatic+clicker+no+ads
    • http://reduslim-sito.site/los_lobulos_cerebrales_y_sus_funciones41t9g.pdf
    • http://sovuradema.medianewsonline.com/lunavimo.pdf
    • http://folugomobok.getenjoyment.net/tozetowekuxuzewux.pdf
    • http://nituzovido.getenjoyment.net/58400608883.pdf
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/xalajudoxifig.pdf
    • http://ylyn.ru/jazodipukoqk6dq.pdf
    • http://natiral.space/81233829374rksw7.pdf
    • http://wiinorama.fun/good_tan_dog_namescljoo.pdf
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/safivoxakilibajomet.pdf
    • http://worldhold.online/hp_switch_zl_modules_installation_guidej0bc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_0b8f207d429e4281ac93eb9460c21dd0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f107e0a5-867f-408f-892f-fbe3ddc41445/nuzekojirate.pdf
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_a32100e2b8fc41e28a6e9ebcf00e62e2.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_fa5de44b3ed24642abdfd1972455e2d1.pdf?index=true
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_2a242b86202c4bddac9ba76ca834e688.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9df1a23a-462e-4780-96bb-d109f6509c57/77407152705.pdf
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_7b32d45f362c4c50b89c17fd61bb41ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13d496e0-ff2b-4468-9f7e-be0e1cc20e47/16055847108.pdf
    • https://uploads.strikinglycdn.com/files/f3acf7ff-6b47-4229-9017-3c8552295ef5/vuwakinof.pdf
    • http://jokosen.atwebpages.com/63384262620.pdf
    • https://uploads.strikinglycdn.com/files/af89fee2-1d42-4151-812a-c7279fa6aeab/how_many_the_princess_diaries_books_are_there.pdf
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_38c494d89715468d947f87b0a7785b45.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda7.bin
1f712149d9c3e9b94d24de5534341d0b6070b7b89a2fdbbd61a3e235cd9d4b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 5140 bytes
font_01_sfnt_off0000ef04.bin
bc72954f3659cfe4c7e5a993cef6e73ff0be00a3991fc920fa905c1dc3d1d175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.