Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f55698fbcf3763e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 11:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ac8f8b93a16d5be2d9af512333939b4d SHA-1: 5e49d3150d3999f02eb25ced61203af829b131d2 SHA-256: 0f55698fbcf3763e4f9df0268db69886082bf27ba5ea4ab22aa4186a95c92692
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, with one pointing to 'fokemale.ru', which is associated with a link farm and potentially malicious redirection. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious software by masquerading as a necessary update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/strik?utm_term=autocad+3d+web+viewer PDF link annotation
    • http://karnaval.host/567583117244aiym.pdfIn PDF document text
    • http://nonretloli.site/11546353478pz72e.pdfIn PDF document text
    • http://itactical.xyz/why_do_canker_sores_form_on_tonguetvfmc.pdfIn PDF document text
    • http://7lessons.site/d_d_gm_guidezqo34.pdfIn PDF document text
    • http://jushq.pro/8349628645okyhr.pdfIn PDF document text
    • http://thesalle.xyz/how_much_does_it_cost_to_install_pool_heatingh8pel.pdfIn PDF document text
    • http://toportt.online/jiwizejedogudefadikijevp9go.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/447493485714gz93.pdfIn PDF document text
    • http://marketes.pro/kayle_arurf_guide76co9.pdfIn PDF document text
    • http://ladyso.ru/sezerigopum04020.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/simujix/50th_birthday_invitation_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/biboj.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_57c1cf10fb2d4532a4ecc9431e34f8c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/children_s_formal_dresses_australia_afterpay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4906d173-2328-484f-b20d-ad93dce2ed64/how_to_make_a_jelly_roll_quilt_for_beginners.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_db9a190e161647658d98ec4b92ac1dd8.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_97a4d8f72e844c16b5b2336697bec089.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_abdc1bf06a5742549b496b70b49aac3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6691f5-2069-4e09-b7d0-3b90ec57cb4a/how_much_does_echo_dot_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e5ad9c-74b7-4696-9c0e-22177d36bb44/logitech_x_540_specs.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_ea8ce8e161c8490ea649b331892fed1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ad9e0b-f92d-445a-b8ad-1aee3bfcbbfe/fe_exam_mechanical_sample_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6097310b-bcac-4046-a93b-0a9dcddfa89a/54661928953.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_c59a892aa4a544929202d1852c38a8d2.pdf?index=trueIn 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_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5168 bytes
SHA-256: 29964204a289cf2912ead61fbf7a9e47d7da4ed47f7d567bd15b05f6d0092c11
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 11236 bytes
SHA-256: b69b58f64796463011b45db36a49160951c2fd0e2d2048b4071f9c2b5e9a816d