Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10634eb393fa37…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 18:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c3f142d94d18f9fbff483f4c24718c SHA-1: dc55ea54f66311fd5450dbaaccd588cba4149935 SHA-256: 3f10634eb393fa37dd80244bf4ab95d3f39bdb168ab3f7f3b0099c0187a2a0a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'botokaw.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM', suggests the document is part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=un+metro+cuadrado+cuantos+milimetros+cuadrados+tiene
    • http://tokiridevifo.medianewsonline.com/astronomy_101.pdf
    • http://wutugidejavazu.scienceontheweb.net/mahalaxmi_calendar_october_2020_download.pdf
    • http://gisoboxizaza.mygamesonline.org/which_civilization_formed_in_the_nile_river_valley.pdf
    • http://lulilafemavivog.mygamesonline.org/damoxen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_dea6801865834389a89837aa71f42e62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/367a44b3-1b52-4074-b8b4-6ee44afaf1c6/wexetujomebuliluxenedap.pdf
    • https://uploads.strikinglycdn.com/files/56c92b1c-35f3-41c2-af08-cdd16f70ca49/31349454288.pdf
    • https://s3.amazonaws.com/gotenukevepunin/unity_download_stuck_at_99_mac.pdf
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_f6f3fca076d5483f8ee8e75db83c7894.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_dc729c4733ee40c0a333fd9a86fbdcd5.pdf?index=true
    • http://kifesafijupesob.onlinewebshop.net/74310409339.pdf
    • https://uploads.strikinglycdn.com/files/aac9b12e-4954-4254-aa70-448e8fd12e56/j.j._kellers_osha_safety_training_handbook.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_c460709794194737ae47a6880ad3c783.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19666c00-f745-4ed7-a5ac-4fef7af690f7/dudemapitonumilubevux.pdf
    • https://s3.amazonaws.com/sagotomagin/69707587725.pdf
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_63b09f24c444460fa8a06e8fc8a7be5b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df26.bin
fb686fbc5478ccba18cdbbb11a539466204425ef59d6d8e7dd0d06778ab0814b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 4960 bytes
font_01_sfnt_off0000efde.bin
1e0e4cd6691419181464d239b5b7c2c7f0c54060c565175dbb7926e1dec851b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 11288 bytes
font_02_sfnt_off000114e7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 4324 bytes

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