Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc6dc361af587db…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 08:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e0367a20212e4f52c867772c315a25a SHA-1: 17e80fcf70a14ea6f8627cd74805b2447719c8d1 SHA-256: 4fc6dc361af587db6dc6ce9751cb6ea4e82ca2f41903142bf1b6015579fd40aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a strong indicator of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=what+is+meant+by+power+dissipation
    • http://hookup682.site/el_diario_de_greg_2_en_espaol_latinonweq6.pdf
    • http://kidufamipowanot.mywebcommunity.org/beats_by_dre_studio_2_wireless_outside_exterior_panel.pdf
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ffaa4ae06c1a.pdf
    • https://static.s123-cdn-static.com/uploads/4402247/normal_60067cffc1473.pdf
    • http://1xbets-reg.site/ferrel_g_stremler_introduction_to_communication_systemsi7s4a.pdf
    • http://tuwimig.scienceontheweb.net/wemimipebuvodijifibevo.pdf
    • http://logoped-samara.ru/nimoloaqugg.pdf
    • http://verification-help.business/lixasojejonefsrnur.pdf
    • http://24magazine.ru/nujobililukort7aef.pdf
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc6d94d79056.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavotuvezomevi.myartsonline.com/social_work_research_jobs.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_736d13b6af4d479194b4d675d3012ffd.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_9d6cc79f352240c3a66e6f1d78a79ef7.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_d3f50bac79a44406a02c4dc68c3e9b02.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_2d4600ede3374284b7f96859c968fe1b.pdf?index=true
    • http://pusebirenox.myartsonline.com/95749820876.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc3.bin
f737fe40135faae3ba62b73fff25397f2300d6a3937e1e826f50fcba62d073a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 5516 bytes
font_01_sfnt_off0000fe67.bin
8838acbdf160e1d6b9711442bfade4d4e2d04cc467f3bc82bcd7640f098fe56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11532 bytes

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