Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d86a6d2889a2913…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 12:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da425feaa5f209200d3a57463a8d7fa SHA-1: 2e9146a9aac2ed979e5f1c7bc6180887ddd56343 SHA-256: 4d86a6d2889a291311c0f10f2d3046acae01cc424710e03fa39b434d1ab6bf81
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous external links, with a primary focus on directing users to 'vilenefex.ru', likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=tartine+bread+whole+foods
    • https://cdn.sqhk.co/vixukose/eVidsib/15376700534.pdf
    • https://cdn.sqhk.co/wexapitode/0gfjedn/85649488967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_07fc6cfd8e1349f79d8dac344b2bef04.pdf?index=true
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_a04bc02d49f24b0da4e3777406730ae7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0fd9722d-ca68-4ecf-b88c-e9549d2576ff/one_punch_man_garou_x_reader_angst.pdf
    • https://uploads.strikinglycdn.com/files/2a9b55c7-859a-45b8-a378-ba6340f8704b/vagexevevibunozejeka.pdf
    • https://s3.amazonaws.com/pibabopuduj/99728861865.pdf
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_db4ffbe7a5164e619f11a6a2a8a79ab8.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_f3fa64ac7b4a422687e6c134d81671ff.pdf?index=true
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_a2c6e156bdd44ace9b777231e9322cb5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ff68acce-6933-410b-9c7f-06329f3f52b8/meade_etx_125_telescope_accessories.pdf
    • https://uploads.strikinglycdn.com/files/7e6a821d-5a07-4f09-a2e6-c284c1a56f1f/kyocera_printer_toner_powder_price.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_c160738ba062469aabeb7846ec293121.pdf?index=true
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_6a5c7863021a489280c616294360c660.pdf?index=true
    • https://s3.amazonaws.com/xidazeze/bleacher_report_live_roku_app.pdf
    • http://timawerana.epizy.com/can_default_judgement_be_set_aside.pdf
    • http://gujodupilewibo.epizy.com/tawaw.pdf
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_cc891c8d6cb24a678a950a2e9b3f5370.pdf?index=true
    • http://soxosodazafu.epizy.com/53728875082.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_off0000f051.bin
6593d14d04d5f0fccbe2ce4e4a3bc6492482fb49c9d2212119a668ffca42da76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5176 bytes
font_01_sfnt_off000101f4.bin
b6d48f42398f73262e249f5dd81bed797cbde2e61bc795ebad22308102a2b964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 11532 bytes

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