Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadd22f4d9278cf0…

MALICIOUS

PDF

88.8 KB Created: 2021-02-27 14:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2663bbf7e9771bac622eb5946b2fb8fb SHA-1: 005aaf2914b6aaed7da7480853450e9a3ffcd98e SHA-256: eadd22f4d9278cf000a6c0dc55e48119e31d9ba380f812441128b55649c2b9ad
134 Risk Score

Malware Insights

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

The sample is a PDF document that contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=fundamentals+of+statistical+and+thermal+physics+solutions PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/eibjfjg/gejumibowabexobimip.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/jbIjfCG/38286290882.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/geghvj1/samsung_level_active_headphones_instructions.pdfIn PDF document text
    • http://czecheducation.space/rudedopomupd26.pdfIn PDF document text
    • http://nuzofofe.iblogger.org/assoluto_racing_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/igjbs7r/pokemon_hd_wallpaper_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/dSk4XkH/lumosity_brain_training_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/hehdgcM/crossing_church_of_the_nazarene.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://jefevuxivux.epizy.com/orissa_human_development_report_2011.pdfIn PDF document text
    • http://pawutewitozi.epizy.com/mimuturu.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/bunil.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/3524889333.pdfIn PDF document text
    • http://mesipupip.rf.gd/tesoguxibifitukavuw.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/vascular_surgery_society_guidelines.pdfIn PDF document text
    • http://pavoserelolaw.epizy.com/35650471326.pdfIn PDF document text
    • http://paruwegugu.rf.gd/pathfinder_player_companion_alchemy_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 3448 bytes
SHA-256: 2e8459269b465a54b9328ffff5a2b30699d066d1dd805c2d3d444a604bbf9980
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 5336 bytes
SHA-256: ca4314da45b442bf8a981bff78eb6dd8ca36548df42be859d5f7d0ec9af647a7
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 13524 bytes
SHA-256: 1c253a17fcfbf75bc1a9b138beab1e073f5a61ce99d4c473b4e841e2d4caf7a2
font_03_sfnt_off0001470b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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