Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82ef9da464fdaf0…

MALICIOUS

PDF

82.2 KB Created: 2021-05-21 00:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94c3be83620bac91ac73659ac2ed55bf SHA-1: 152846224ba348fc4ff4c0843bf815fba260b9bb SHA-256: c82ef9da464fdaf0f59d5f4b3121bda537daf6a36c503dec27d6503737401300
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point to a campaign distributing malicious content through deceptive document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=casio+g-shock+3230+manual+espa%25C3%25B1ol PDF link annotation
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/b2a0ce2da724.pdfIn PDF document text
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/7545e.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/9874355.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/vemuziledomaxip-nuvimawok.pdfIn PDF document text
    • https://zuzidoparifiga.weebly.com/uploads/1/3/5/3/135302874/wivaropedukod_xofuridatovovo.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/5224781.pdfIn PDF document text
    • https://nozesebekujizaj.weebly.com/uploads/1/3/4/6/134698307/ravubuginob_fibesobemiz_tufibokeful_wisiruxazetuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_605d93f1d5d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_600c06caa4e2e.pdfIn PDF document text
    • https://dupivujo.weebly.com/uploads/1/3/4/6/134612497/5080994.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/8ad1af7b0cd.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/rubus_fenopo_napopa.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/c21de2127e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_5fe95ae397e01.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/mokevigerojota-gifuf-mikotujivodepos.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/tinezedu/how_to_auto_program_charter_remote_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/96171169709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78529372-3f93-41b8-9e8a-e08fec7edcaf/9860970152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3168be-9c48-43b5-9919-1b74d3297882/88882924388.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/byrne_brothers_formwork_ltd_v_baird.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_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 5900 bytes
SHA-256: a9f2d654df6a4f4ace27308f109d83bf7bd2ae9ffb9d373e1a4d23f1de00f92b
font_01_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 11896 bytes
SHA-256: 96671fcd69072485d198d2ab5a8affb4b515cc28c41dfac2398f7e48af95ac3f