Malicious PDF — malware analysis report

Static analysis result for SHA-256 0543a5fe84894c49…

MALICIOUS

PDF

82.0 KB Created: 2021-02-13 23:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1213d52a183cb7ae0a12ddc5f75efc55 SHA-1: 2f924451cb2ba9a3be3cdca18f550c04475bda9e SHA-256: 0543a5fe84894c499b8e8b6a8e55efbce40970ed59c8d3d23f4b2f8f3e151266
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'maypoin.ru' which is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wb?keyword=how%20to%20restore%20dingy%20white%20sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450509/normal_601cf91f30e0f.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/54755866943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5ffd0d449ba18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_600eb63004511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5ff68ebf28b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5ff0ba2de686a.pdfIn PDF document text
    • http://yogist.fun/fafezinegupamipulixonirx1zv.pdfIn PDF document text
    • https://turugoduzo.weebly.com/uploads/1/3/0/7/130739986/913804.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/mofevutinif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fea265154477.pdfIn PDF document text
    • http://ro-shop.space/185793748931nw08.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/1643220.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/patugotoxufikamiz.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/nanorigefowawafuwopoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_601d0596a10b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tagitefidunun.epizy.com/wijuxibetefo.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/kimovesokofivisa.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/utorrent_pro_android_slow.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/fivexitebofuwo.pdfIn PDF document text
    • http://negavutagogo.epizy.com/bilderbuchkino_mutig_mutig.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/draughts_board_game.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/95261202951.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 4788 bytes
SHA-256: b48ec9ea75343d4be291374bc8e797e33a39a506f42d9539447316334252dd12
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 10916 bytes
SHA-256: c69ca7a4b142c0d53f2247fc0fd7c8c6d51e958be7e1343089bb2a3d92608583
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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