Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd73b0a7f57a00…

MALICIOUS

PDF

68.7 KB Created: 2021-02-25 09:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0279d453a74eb83dd1f31b0bdd56ffc9 SHA-1: c89bf5a66cbeb0d3038d5b63e69481e62cd6b2f7 SHA-256: 3fbd73b0a7f57a003ef5d3431290029a87196d5d86f5a4e6f9ef8be321b9fd02
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=mi+propio+auto+chapter+10+vocab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5fd67a1e77ae4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5fe5c51ecdc4e.pdfIn PDF document text
    • http://vandify.com/8785523385390z5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fe6fc04c163e.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/fgchdty/katimajirafoket.pdfIn PDF document text
    • http://amsidisi.xyz/jumpin_jack_flash_bass_tabm3n3b.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/9ex4Fid/emergency_alert_system_application.pdfIn PDF document text
    • http://ziwefewixus.iblogger.org/lloyd_s_of_london_annual_report.pdfIn PDF document text
    • http://brosbass.com/career_path_planningnzish.pdfIn PDF document text
    • http://misiliv.66ghz.com/analogy_reasoning_with_solution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinedolorexos.rf.gd/jazelijetasawodu.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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 5208 bytes
SHA-256: 7f7b3d94eae13366482d4df97684fcacb42f1a050727c0a66d62da150cc83a13
font_01_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 12164 bytes
SHA-256: 9425a758a0a041562427b3e3ae24b6f889ce320bbddca13b53795aa2810ead5e

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