Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b41ee722d876b77…

MALICIOUS

PDF

77.8 KB Created: 2021-05-22 17:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bc0e5e27e9f59c99a9a9d0efcdb0f07 SHA-1: d9ee44516dd3a0452745a602775ff55e685ca29f SHA-256: 1b41ee722d876b776b24b4ca2b5160dafa0f97ee310209c97fc9bb73bf58c3d5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with a primary malicious URL pointing to vilenefex.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=my%20name%20is%20red%20orhan%20pamuk%20vk
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/nidozovibab.pdf
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/4d370ae820ea989.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_605012a9bb8f4.pdf
    • https://gedinabudi.weebly.com/uploads/1/3/0/8/130814056/tezanalurokad.pdf
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fd1448be5b38.pdf
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/zifokija.pdf
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/74ea90242d39df4.pdf
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe3fdbb56930.pdf
    • https://tesejusijup.weebly.com/uploads/1/3/4/7/134704228/xuketovojifi.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6051e7562ff86.pdf
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/nuriguvero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6a0709d-feb5-44a1-867c-9f813b26c9bb/real_analysis_krishna_series_download.pdf
    • https://uploads.strikinglycdn.com/files/c2e44f9a-095a-4c1b-94ad-a4bd6bdb644c/kenmore_gas_range_790_manual.pdf
    • https://uploads.strikinglycdn.com/files/042a185e-602d-4f9f-adff-842f667f39c3/cuisinart_single_cup_coffee_maker_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/c77cde7e-7a21-47b1-9648-d135aea76fa3/cgp_gcse_physics_workbook_answers_edexcel.pdf
    • https://uploads.strikinglycdn.com/files/24145c19-a2a4-465a-b7d4-7032585330fe/8389989344.pdf
    • https://uploads.strikinglycdn.com/files/ade56ab8-6121-4fe1-9a70-129b53743d35/can_i_renew_my_notary_license_online.pdf
    • https://uploads.strikinglycdn.com/files/b3492f6f-e16b-492b-b3e3-3dcf4f4e07b3/how_to_grease_a_pampered_chef_bundt_pan.pdf
    • https://uploads.strikinglycdn.com/files/4346b8ce-dc9b-4f16-903c-4328e586ec04/sanakumegobajikibaj.pdf
    • https://uploads.strikinglycdn.com/files/d8032669-2027-48fe-9c7f-96a53d5c908e/vikaregadimerovivaliban.pdf
    • https://uploads.strikinglycdn.com/files/c1258915-cd20-48dd-bbfd-b3bacaacd0e6/fupifuzefojuwevujujapaku.pdf
    • https://uploads.strikinglycdn.com/files/28d08bc5-9018-427d-b2fe-cd4a4520f21f/pegakaxupinuwepuvinu.pdf
    • https://uploads.strikinglycdn.com/files/3eb61f8b-f6ea-4136-a2d7-45a3cde33f7a/nogupilibaz.pdf
    • 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_off0000ef04.bin
8bdec71a4928c908903f217a08fce8bd5628d3fa76deeaaa7b96c1b5ee8e9172		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5400 bytes
font_01_sfnt_off0001014b.bin
f3bad2e31552030c91d971538655e405741aaa771e8d7d73ef078a0a9cfb209c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11940 bytes

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