Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aec67eea3b3968…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 18:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4d1b8a9eaba485d8756f058c9e419ded SHA-1: 2e143aff87728e61bfc16f8597e3867a07150986 SHA-256: 72aec67eea3b3968f02ca8e7346a2a65ca18a358175a101ccfab7b25dce9363e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one to 'kuzutuzo.ru', which is likely part of a link farm designed to distribute malicious content. The embedded URL and the PDF's structure suggest it's intended to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=kohler+automatic+transfer+switch+manual PDF link annotation
    • https://cdn.sqhk.co/fowoleleda/fGiaNLy/81724085367.pdfIn PDF document text
    • https://cdn.sqhk.co/meparifemoji/jgnPGBR/fax_cover_sheet_template.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/hJ0iaUc/walesi_setup_guide_fiji.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/TijwopE/weather_map_real_time_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/Bhfc4hc/20572188970.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/bogijexu/22997177570.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/bilavuwatilig.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/hypertension_guideline_aha_2018.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_48304209d5644e56a3fc09ac73299e61.pdf?index=trueIn PDF document text
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_3eb47579475644c28167d6d6eb4b2217.pdf?index=trueIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_c7a1e0c4f36c406db896ec26ac06b15c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/acer_monitor_power_button_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/celtx_free_mac_os_x.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_8efc5ffc6f2f45329f64ee7b1ddd4340.pdf?index=trueIn PDF document text
    • http://vetebiba.rf.gd/knowledge_of_the_holy_one_tozer.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/84081108420.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/creating_a_business_budget_spreadsheet_in_excel.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_f4c7aa0b94844c39a26bb0671555c82c.pdf?index=trueIn PDF document text
    • http://nexogakaxeju.epizy.com/81094641853.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_54bb001230664d67ad45edd04f1f41fa.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_7ed868e629fb4b688d7eb2845853b5cb.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_58b20bebb6304dc7a86c44437643f776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/comcast_remote_codes_for_element_roku_tv.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_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 5180 bytes
SHA-256: 691be45e8bf135c188da7512b77aec68365fb0d9277b7c3f4198174ae93ccc17
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 11168 bytes
SHA-256: c81732d683a7a11f0ffc0f7149d598abf4b163ffdbfc7d31301c4e7da811f9a8

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