Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c4d4c023c09c74…

MALICIOUS

PDF

76.5 KB Created: 2021-04-18 02:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4d798627b23c1e84298d4ebf835b89a2 SHA-1: d42c6fe3869d17a661e27a3abad00d2a7260db2e SHA-256: c5c4d4c023c09c7449badbf591be4836868280b9765b9a477f82d1a16c6e7629
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it is an SEO redirector link, likely for a phishing lure. The embedded URL `https://bologen.ru/strik?utm_term=cual+es+la+organizaci%25C3%25B3n+comercial+de+una+empresa` is flagged as a redirector. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=cual+es+la+organizaci%25C3%25B3n+comercial+de+una+empresa PDF link annotation
    • http://summ-green.fun/how_increase_your_vertical_jumpp9ick.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/OnvgjgF/study_skills_curriculum_middle_school_free.pdfIn PDF document text
    • http://hangookoil.ru/14398558425gnxy3.pdfIn PDF document text
    • http://nasporte1.fun/vegan_keto_diet_planiv4cr.pdfIn PDF document text
    • http://onlinetyz.xyz/php_date_mysql_formpp2t5.pdfIn PDF document text
    • http://all-host.site/jifixoximazogewusasasodufp3e.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/Dt1hdjf/rudomolinimami.pdfIn PDF document text
    • http://zoneeuro.pro/how_to_light_up_electric_fireplacel2lvj.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/iiJNRBv/call_of_duty_world_war_zombies_trailer.pdfIn PDF document text
    • http://eushopvmn.site/credit_rating_report_ireland98um3.pdfIn PDF document text
    • http://setofexperience.site/quick_video_recorder_mod_apkbv9v8.pdfIn PDF document text
    • http://islemleriniz.org/honda_pilot_maintenance_codes_b16ajxbb.pdfIn PDF document text
    • http://faceit.su/sagiroxafedatawqxge5.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/lerezazo/blank_brochure_template_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5b2636-8fbf-4c90-9a3c-07f8f08eef05/how_to_draw_a_face_easy_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/project_business_case_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/how_to_put_vinyl_on_glass_cricut.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/lowitolegomod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef6e380-5815-4cc5-9d43-afa3edcb2709/85593935167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa899e9-dcbe-4395-9a60-84e64e741371/punomizapibusolekifuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/demusasitopuda.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/whats_another_word_for_unity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a500dcce-50f1-4843-afb4-6143f8961ece/how_accurate_are_bodyfat_scales_at_gym.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/kimepekogiweno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f252c41-4666-43b7-990e-325369acedee/kawugurupozu.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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 5484 bytes
SHA-256: dceff7c9b02d7fcebb7ea5a97fbcd071e063e5d8b1da27db71d1bff560418d64
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 11764 bytes
SHA-256: 11d838f10b79e3af5e8ffef88909efb0ba0e6a4637be7869de703119470e9638