Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ecf965b47061c3…

MALICIOUS

PDF

82.3 KB Created: 2021-04-09 18:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8fb45c40a9d2b64d349f9d24a99a62af SHA-1: 95478dc7cdba6670ba1e716b6a8dbf89d9f9c2cf SHA-256: 85ecf965b47061c375e953158e66bf9ca8ffef9e8aa30c963a8b93f57c86b0c7
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one notable example being https://druttle.ru/strik?utm_term=educational+psychologist+salary+ireland+hse, suggesting it functions as a link farm. This behavior aligns with phishing or malware distribution tactics, where users are directed to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=educational+psychologist+salary+ireland+hse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454559/normal_603cb3bcf33a5.pdfIn PDF document text
    • http://limezage.scienceontheweb.net/types_of_bolts_and_their_uses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_60009e6f16383.pdfIn PDF document text
    • http://swiss-gear.store/horizon_chase_world_tour_full_game_apki0nna.pdfIn PDF document text
    • http://razvivatel.blog/data_analytics_platform_proposal1slgv.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/9667288872.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/aXjjDUV/lock_screen_picture_location_windows_10_registry.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/eeicPvV/tool_puzzle_3d_app.pdfIn PDF document text
    • http://trastenmyqort.online/agroforestry_practicesabvt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_606285e73410d.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/Eheohen/twistee_treat_franchise_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/heAfmhg/65765603295.pdfIn PDF document text
    • http://topcreditreport.info/733585171739rmdf.pdfIn PDF document text
    • http://pixalowedu.22web.org/livafosanabizevaro.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/JgfpWha/10597324470.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/tkVjegf/bubble_breaker_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/Xjciaef/download_spaceflight_simulator_1._5_unlocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/L6gicYE/29500721153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likutolejit.onlinewebshop.net/uke_chord_chart.pdfIn PDF document text
    • http://watotiwima.rf.gd/37722219157.pdfIn PDF document text
    • http://zaveravezujob.epizy.com/mebivogetaluzufoxalegexup.pdfIn PDF document text
    • http://duxurajixi.rf.gd/tuzozumiminawonus.pdfIn PDF document text
    • http://vuzozan.epizy.com/77145923504.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_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 5396 bytes
SHA-256: 6a0d306ed7770be6fbf84e63cbe180a06a5748f76876dd3c73fe811aace046cd
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 11324 bytes
SHA-256: 71dd4e62d80f4148d0e6ba954eb3aa402f049c288d76717972b82bc1a51f0a25

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