Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea8f60b9bc95948…

MALICIOUS

PDF

77.3 KB Created: 2021-02-13 11:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0a248269162cf00764c8afe26d0ceba SHA-1: 02f43646d19e968c78e2b4c4bcbe9380313a82dc SHA-256: 0ea8f60b9bc959484baf361c40c6e7f818125d14e0f5a792b395ec69e9ce2d08
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. It contains numerous external URLs, suggesting an attempt to redirect the user to malicious sites. The PDF's structure and embedded links point towards a link farm or content-luring tactic, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wb?keyword=carmelite%20breviary%20pdf PDF link annotation
    • http://jesiguvolen.22web.org/dancing_queen_sheet_music_alto_saxophone.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jojfl99/48951426076.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/hfvaa7c/wagabewegijavabofuda.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/7jfjdO9/tusasemeteruvelibif.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/jijjgHR/zodafoparufamuditebawajig.pdfIn PDF document text
    • http://lajibodomemebev.66ghz.com/33808932014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425913/normal_6005da057a4e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5ff52e3474362.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/b7ggidI/63171571145.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/bjfchiE/84859710206.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/vLgheig/prison_escape_puzzle_walkthrough_level_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_60106e3535cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60104c3fa82f4.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/U4jfIji/17223134216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupewujivijulo.epizy.com/tukivozotega.pdfIn PDF document text
    • http://xerevim.epizy.com/47237285502.pdfIn PDF document text
    • http://xufutat.epizy.com/angularjs_material_icons.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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 5216 bytes
SHA-256: 13412e98893fd413307887039b40a0bfc5b4f6bd4c386c8ff45735b714f5a593
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 10184 bytes
SHA-256: e7972c26c5872f362f3a53c5565aca24ef5a89a109d48b207ad7d4aa9135fc48

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