Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d17cb8a2bacfff6…

MALICIOUS

PDF

78.4 KB Created: 2021-04-16 10:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6e09431766490873b03373a6885dd931 SHA-1: 25443691ccc2f7ccf68f2a064edaf9d222634940 SHA-256: 5d17cb8a2bacfff6609919cf1e368be40dd8b466c869e7afa4a27e661c048a29
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('vilenefex.ru' and 'tokio-2020.fun') that are likely part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of these URLs strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vilenefex.ru/strik?utm_term=barnett+vortex+manual+pdf PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/5681771.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/zanab_mokitovuziwene_kepeluwu_zagina.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/ich6nif/business_process_reengineering_examples.pdfIn PDF document text
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/8258097.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/HRhiWia/78340768391.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/gfdtCQW/cartoon_girl_wallpaper_images_hd.pdfIn PDF document text
    • http://ratugageju.22web.org/como_aprender_ingles_rapido_e_sozinho.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/4941930.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/70343241895rf3zu.pdfIn PDF document text
    • https://topepixifugop.weebly.com/uploads/1/3/4/3/134322533/8b9b207cc296c90.pdfIn PDF document text
    • http://levantegroup.net/bitelagifudipozefvmfhe.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/backbeat_fit_3150_pairinglmujk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juduk/vernier_caliper_measurement_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/innova_3160g_code_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/82486379074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de863c5f-03cc-481b-92d1-8fd5758e2788/45461122268.pdfIn PDF document text
    • http://pijerogovilowum.rf.gd/zepafunezabunawimibobazux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c63625-13bf-493f-83fa-172209828ece/smokey_mountain_cooker_smoker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc5aa61-e9f7-445d-beb2-4b2d2805f4c9/40284710731.pdfIn PDF document text
    • http://zebinagapovu.epizy.com/fakebook_online_template.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/87244448570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acbc4be-0de2-4c06-aece-98b16a5c8b07/decision_tree_model_definition.pdfIn PDF document text
    • http://wawefib.rf.gd/zobibiwazavaw.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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5184 bytes
SHA-256: 3295bee946513377e4342963210cf1f37747ba4f271724e64c171424d8403f61
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 11484 bytes
SHA-256: 670e1de0f5f37b38647590385b4777d76e1e0c6d11deb3ee9728b5fba3d572b6