Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373c556a79415eb…

MALICIOUS

PDF

74.1 KB Created: 2021-05-03 06:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c2f96cc0f9ee345e40ecdb0ffd7fdf2 SHA-1: 7b2340894b7e5d4effd102d4af96abd59c1d4de3 SHA-256: f373c556a79415eba54b77659189423b45e1651a4e813e278c60b1e97620f780
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a URL pointing to 'fokemale.ru' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=public+budgeting+systems+9th+edition+ebook PDF link annotation
    • http://malapiwo.66ghz.com/sitiwesasakiwepafazaz.pdfIn PDF document text
    • http://folibesawebowiv.22web.org/peter_atkins_julio_de_paula_physical_chemistry.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/88553901735.pdfIn PDF document text
    • http://vapawuruvoxo.22web.org/marvel_movie_in_order_avengers_endgame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/49692150333.pdfIn PDF document text
    • http://zewuxulaza.rf.gd/environmental_design_in_architecture.pdfIn PDF document text
    • http://nakogis.myartsonline.com/fulasiwegarekiwevurapa.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/63339850128.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/viresi.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/locanda_locatelli_michelin_guide.pdfIn PDF document text
    • http://somifinufax.rf.gd/vukovirigewixovafezufapip.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/becker_cpa_auditing.pdfIn PDF document text
    • http://punugituk.epizy.com/multi_engine_flight_test_report.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/what_happens_to_an_objects_kinetic_energy_as_speed_increases.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_e670fac0e6f24192bf0b6ffabbcd9f28.pdf?index=trueIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_da2d3481bbc94ce4af4079994072b77c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/computer_teacher_interview_questions_and_answers.pdfIn PDF document text
    • http://jetelusaxidu.epizy.com/94164546866.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_32cc006d2a8d401ebf5a6e797d3325be.pdf?index=trueIn PDF document text
    • http://mulukamuzadesew.epizy.com/christmas_carol_remix_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/go_go_scooter_battery_box_removal.pdfIn PDF document text
    • http://wadatenut.rf.gd/99929490649.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/ghansoli_mumbai_weather_report.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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 5508 bytes
SHA-256: 4c20e31a5d55b7f9f69946afed5cd080e0b249f4fe04bf9f5c19b47eeaa79097
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10800 bytes
SHA-256: d660116f064dfc22db361a79638ec74f819f359bddc040113dee9e21dc65bd43

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