Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f903fc0dc694129…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 22:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 121b0c8a4e8acd6db89e831fbb7bbc78 SHA-1: c16cec8b4fbb355191a085afe8fcbbaa153c472a SHA-256: 3f903fc0dc6941295b0e971394e10f2e3d92bdf04a8556f512aefef91a5f9199
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting an attempt to obscure the true destination. The 'Remote-support tool lure' heuristic indicates the document's content is designed to trick the user into installing or running remote access software, a common tactic for gaining initial access or facilitating further compromise. No scripts were extracted from this sample, but the presence of embedded URIs and the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://baarspo.ru/wix?keyword=dr+pen+needle+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482880/normal_5fd8d0a6f3ed3.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hiEhajR/89707989677.pdfIn PDF document text
    • https://cdn.sqhk.co/jepinixawide/9ifhcsq/44530399875.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/gfjjc0Z/preschool_assistant_director_jobs_near_me.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://stavki.link/favuxalekumumuzitevabini0fqdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6021f773f3f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_60365ceb3c814.pdfIn PDF document text
    • http://insta-sale.site/how_are_kinetic_and_potential_energy_relatedcbyin.pdfIn PDF document text
    • http://ontrade.top/clear_vrchat_cachecbgxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedisupekak.epizy.com/akeelah_and_the_bee_free_video.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/86984209584.pdfIn PDF document text
    • http://pivekukevojadu.epizy.com/4809880204.pdfIn PDF document text
    • http://sufekowanak.rf.gd/lovivijadosibe.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sujoziminor.pdfIn PDF document text
    • http://patepuxowibano.rf.gd/91336526205.pdfIn PDF document text
    • http://pugobisijutefe.epizy.com/62162225573.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/shakespeare_the_tempest_characters.pdfIn PDF document text
    • http://debukigezi.epizy.com/teamviewer_5_filehippo.pdfIn PDF document text
    • http://mokineso.epizy.com/92609428091.pdfIn PDF document text
    • http://bujisovi.epizy.com/74381830258.pdfIn PDF document text
    • http://dinixebun.epizy.com/louisiana_literacy_test_1964_answers.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 4980 bytes
SHA-256: befad4e04ad0bbda9b358281c70003e6e4e544db512119902deeb0674365bb7e
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10540 bytes
SHA-256: f33e5a782c1c55ebb238c6404f427a5e0eb585b4adf5656ed6ef5f223c6ed108

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