Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfb0db5641a51a8…

MALICIOUS

PDF

74.3 KB Created: 2021-02-08 18:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9df31902228b82db0e47d4e832dce5e2 SHA-1: 1f32ea206a8e3e03aa6c5d56226150b05276c197 SHA-256: 3dfb0db5641a51a8aefd4ea4b318c1d496073f402c699e870d7371f045b87d44
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The document body and extracted URLs suggest a lure to download a remote support tool, specifically mentioning 'Teamviewer apk android 4.4.2'. The presence of numerous external URIs and link farm characteristics further support a phishing or social engineering attack pattern. No scripts were extracted, but the overall structure and content point towards a malicious document designed to trick users into installing potentially unwanted or malicious software.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/123?utm_term=teamviewer+apk+android+4.4.2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377408/normal_60069f265f7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_5fd76bf8dc3ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386365/normal_5fc690b3d4134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fdc79ce8f466.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/lutawanibibe.pdfIn PDF document text
    • http://copyright-help-report.com/usa_network_app_free_download4pvrl.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/jbgdkhg/jump_through_hoops_meaning_in_urdu.pdfIn PDF document text
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/sizaropaxi_lojadazuv.pdfIn PDF document text
    • http://coloradocustomelectric.com/genipajululegu0t62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_601af22cbe580.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/Cat6Jhb/facebook_messenger_desktop_app_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jggbajd/76864407468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/99acres_app_in_laptop.pdfIn PDF document text
    • http://mowumaja.epizy.com/nufavekilobajusozofosovep.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/o_calvinismo.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/69068072006.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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 5312 bytes
SHA-256: 1ef9e7d01d9136f3cfc795a7a10a85bd5a049eb17b4da7277c9eeb4e8455c677
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10720 bytes
SHA-256: f3ac05300e6354088908dc4d5ca54ff134e695ad2a9f809397d3598ccbd676c0

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