Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e8452180c026e9…

MALICIOUS

PDF

77.4 KB Created: 2021-06-09 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e914cdab840adfee38e69911ae5f799f SHA-1: 987e496a920afbcb87d25725b201ceaae849bff1 SHA-256: 86e8452180c026e994b52796f08614ffcc4a69a9d8c70d1da70ab37f99306d2d
226 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to decrypt an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/pbw?utm_term=malayalam+mp3+zip+file+free+download PDF link annotation
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/vibokid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_605062d16c4ec.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/kubodir.pdfIn PDF document text
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/8547777.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/wigomutefom_bovebenaguxajez.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/vugufi.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/kiduriputoregifu.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/26b83335932eef.pdfIn PDF document text
    • https://sikevitexin.weebly.com/uploads/1/3/5/3/135301450/4cdf9489734b9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_6048095c2a9cb.pdfIn PDF document text
    • https://wobafelu.weebly.com/uploads/1/3/4/6/134613510/jezuxinevosabol.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/5fcfa71e3.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/boxeriwerivoxumazi.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/4781d4ff7531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurilotav.pbworks.com/w/file/fetch/144826329/jozaferedobizedejojemetex.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144453792/auto_rickshaw_permit_mumbai_online_status.pdfIn PDF document text
    • http://razodegotit.pbworks.com/f/how_to_determine_bulb_size.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/f/54743878220.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/whats_in_a_name_worksheet.pdfIn PDF document text
    • http://garigor.pbworks.com/f/how_to_work_westinghouse_tv_without_remote.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144463641/is_wrist_blood_pressure_monitors_accurate.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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5420 bytes
SHA-256: 3f065c61bac7d178cbedca80400b87089c35b9492c26e41ac031d56e1b42b7cb
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10816 bytes
SHA-256: 8ad52b922ae0dcc6c7ceb92ff873b1af7f13608111f377fdbcc8276c57ddb2de