Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1eca3071ff35c5…

MALICIOUS

PDF

71.5 KB Created: 2021-04-20 20:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f9b22591b70c87d3edb5269f18d36fd SHA-1: be2ec09286d728a9a68a5dbbce2c4b2d0b368cc0 SHA-256: db1eca3071ff35c5d4f75715875faff845d7652102741e68f28510fcd6a0d4f7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm designed to redirect users, and specifically mentions a "Browser extension / update installation lure" as a social-engineering path. The embedded URLs, such as https://jumiwimov.ru/strik?utm_term=kitchenaid+stand+mixer+walmart+canada, are likely part of this lure to trick users into downloading malicious content or visiting phishing sites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=kitchenaid+stand+mixer+walmart+canada PDF link annotation
    • http://gitilapen.66ghz.com/88625181326.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/791666963.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/st_francis_retreat_house_easton_pa.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/20026760562.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/tuzilaboxuf.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/panchatantra_tales_in_telugu.pdfIn PDF document text
    • http://punalat.22web.org/white_rodgers_thermostat_1f78_non-prgm_manual.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/atividades_para_alfabetizao.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/fl_studio_tutorial_hip_hop.pdfIn PDF document text
    • http://lixidepobejoji.mypressonline.com/bioclimatic_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6090e3c0-405e-461f-8451-e2da1df6e89a/bevaxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe21e20-3304-4d48-a40f-72fa05129fbc/1002584406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3157e5-8f7f-4543-8ec6-73712d7b2f05/65677740964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ea086d-6246-498d-8a81-3213c34c67b0/paxotumorinokurusejatot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1f6c90-a433-40cc-a76f-437772b28212/fafulipazejujimena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c108a61f-9be1-4629-823d-e712e62f763b/non_destructive_testing_certification_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3579e33-afc5-4113-ba03-27be209f857a/rotisela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece047c2-e8f3-4483-9534-b9ea9ce71e9e/47414891165.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/xaveb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2162f442-9da8-47e7-b8ea-e98657d75a1c/muwiwovivezazow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f923d8-52d0-4860-8f9a-7056e47dc23d/can_i_play_metal_gear_solid_3_on_ps4.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/picatrix_planetary_talismanic_magic.pdfIn PDF document text
    • http://xifetofaramil.rf.gd/wekamede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a948a60d-6c3b-48f0-9cc4-79e6c62caad6/30893127962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85eafe30-ed34-49c2-bef5-0fa29dbd4ba5/bariwagugipusisala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ae59e-0483-4def-87b3-7abc4aa56062/the_story_and_its_writer_10th_edition_barnes_and_noble.pdfIn PDF document text
    • http://tifuwonojize.epizy.com/autoformation_windev_21.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 5308 bytes
SHA-256: e1a6aeda0ffe005be688d8f8465e437fbcc94e1fcae7dfd8884711fb7dbc102b
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 10396 bytes
SHA-256: 664f3d44c65909c3de4229d7d42822a2d9acc57ab4c0ac5d68341e76a957de85

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