Malicious PDF — malware analysis report

Static analysis result for SHA-256 599c3bec4abef91c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 00:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e59e78957d3f958713ff3900f61742d1 SHA-1: 433209dcbf11b2e655ee0d0da1c3ddc2a819f4ec SHA-256: 599c3bec4abef91c096b2c52a8af05a3f9e1da2f4b10d3cc4dd288806f46e23b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a significant number of external links, many pointing to disposable domains and hosted on services like cdn.sqhk.co, indicating a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

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://bologen.ru/aws?utm_term=hymn+sheet+music+for+piano PDF link annotation
    • https://cdn.sqhk.co/nodewanase/vkjcjgF/lusaselijolebaziworanive.pdfIn PDF document text
    • http://smirno.life/viga_baldrameqf3az.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/wigifij/vagirikavodumijivitewadux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5fedd31fd7e74.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/jarhbgg/girifi.pdfIn PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/povawumo.pdfIn PDF document text
    • http://stingeksoj.online/wanodibil5bd0.pdfIn PDF document text
    • http://luchdobro.site/10182576690efif2.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/1EhhLLV/dusurujorenatunetezuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fcf018235856.pdfIn PDF document text
    • http://goldstein.berlin/takinik2jsc.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/jiage5h/4766934228.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
    • https://s3.amazonaws.com/mujesogi/add_watermark_adobe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/firefox_android_bookmarks_location.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/81370676229.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/planet_earth_2_cities_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/lubawafo.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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 5168 bytes
SHA-256: af57c026e7885eeb9f010a5173df59d2c770c3fccf6398215b61ab0a25d1cc97
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10384 bytes
SHA-256: 7fb5a906a7ca41295d52d94b0fa7243f224f0be285b1955e53323c4722f66dbe
font_02_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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