Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae0bf07f616828b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-19 20:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 20422a0b12ac509ab37e4624bfd4bfce SHA-1: 0a0f15241ce968170d9ceca2cbb8dca94bb4111f SHA-256: cae0bf07f616828b650d7b10060a9e8640833d017a5008992b87a92110ae6c6b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL, 'https://mezovuduw.ru/strik?utm_term=kidde+smoke+alarm+i9010+change+battery', appearing to be a lure disguised as a search result. The PDF's structure and the presence of many links suggest it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=kidde+smoke+alarm+i9010+change+battery PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/Xhe7vhb/pipoxepumigino.pdfIn PDF document text
    • http://fordist.ru/plataforma_educamos_colegio_cervantes_talaveraxxj90.pdfIn PDF document text
    • http://prizinsta.online/does_element_roku_tv_have_bluetooth51bln.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/icmYjhJ/crossfit_gymnastic_training_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/bfMijgg/34359723350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tirisesixulisas.rf.gd/english_phonetics_and_phonology_peter_roach_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ba5e62-ccfe-4b59-ad1a-2a79e17391eb/zujezaki.pdfIn PDF document text
    • http://misosemarimo.rf.gd/word_puzzle_2019_answers.pdfIn PDF document text
    • http://gojexevetefe.epizy.com/what_does_the_united_states_constitution_say_about_immigration.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_a735e1f765b74b65b450c612f97b787c.pdf?index=trueIn PDF document text
    • http://vavijiguzedimeg.epizy.com/crowsfoot_grass_herbiguide.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_6700fdb1796c475fb546d08e5968e0e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec682a62-f8af-47a6-a3f5-ae2230959580/kexaruvunuzawiju.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_1eb260743de14253b5b03c08bde0f777.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_2227ac9d5ba44a48b764632ca7d7943f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850ede4-0e63-43f0-8f50-d35cb308b37d/fallout_4_ps4_guide.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_35811bd695cf4c659698eb1d43ea911f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ce9a01-4e88-4833-999e-614de37315da/como_fazer_um.pdfIn PDF document text
    • http://dizujupena.rf.gd/madozekogilopurivufuje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5764 bytes
SHA-256: edea5da69aa9fcff0c53444ef427b2f20bf300a2950e6db61eb6fcc7915c0e10
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 11032 bytes
SHA-256: 0d146c8a4246104d65a9700389d30fec5186ade983202dd51fdfbfc2b301beb8
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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