Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22dbbf027a2539d…

MALICIOUS

PDF

78.0 KB Created: 2021-06-08 13:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2d9242428d675910a5b2387cfcf6beaa SHA-1: 0556e83cfdb4e988d1751ad7f9aee37e5d8d255c SHA-256: c22dbbf027a2539d37482d8b6bc4af86fbc38bc490641a5c6ac7a6df6eb342e8
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'leonvi.ru', suggests an attempt to redirect the user to a malicious site or download a payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm designed for deceptive purposes, likely to trick users into downloading applications.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=bid+or+buy+app+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60659c498a73d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5ff3f51883c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_60200698e2e8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da549c21-02e2-452f-85a0-ff74d9e178ba/descargar_the_king_of_fighters_2002_magic_plus_2_para_neo_geo.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/95235644636.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144683343/cuanto_pies_es_un_metro_cuadrado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f896b82-8bc3-4e00-a951-fac91bbe6b52/96737330403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68344f24-55c6-49b6-ac33-e72d1dae0751/65994901939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94d70f0-6b91-4bad-889f-93b1d1326959/how_much_robux_is_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f541d70d-042f-4a37-b3e6-69dc39ba4225/66505407420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb2a0f8-4843-4e0d-b3da-6601ae35b77c/shakespeare_macbeth_plot.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144564441/granny_outwitt_mod_menu_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234cb650-3536-4b5b-a0ab-e0f502206de6/gumekurunowuludibilunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0215ab-ae63-4091-a0fe-1e572cb82c8c/how_the_grinch_stole_christmas_2000_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e989cde-8a70-4109-a121-fd17b2e06214/mazejegadirirosulipudaso.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/recenseamento_da_populao_angolana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a33e6d-f3d8-4444-bb7c-393f46ef2808/7135753429.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/five_nights_at_baldis_download_game_jolt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b705a92d-cc35-4706-95a6-0de7f6609fa5/76780769883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6143032-3a54-4a76-b73f-16f2ac042e27/schwinn_boundary_mountain_bike_reviews.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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5096 bytes
SHA-256: 414f68d4786e90282ec5a12d9bff9d6710232642161bac823966cb05ef8f474f
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11492 bytes
SHA-256: fbc5e686247038706a69145daeade62366db68e672499c0cb8e24808fc075d1a