Malicious PDF — malware analysis report

Static analysis result for SHA-256 400a788219917a7d…

MALICIOUS

PDF

78.1 KB Created: 2021-04-10 13:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f6bfd5c756834ed657159d71bd56529a SHA-1: baf789e95ad1061a2746e11a08c55fcbeb4aa70e SHA-256: 400a788219917a7d0fd9d7d5c335a5bf7119eff66ddc3a548a2ec8752e28862f
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=el+escudero+de+dios+libro+1+pdf, which is likely part of a phishing campaign.

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
  • 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://jottigo.ru/strik?utm_term=el+escudero+de+dios+libro+1+pdf PDF link annotation
    • http://help-feedback-amzn6.xyz/ham_radio_license_study_guiderqsyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fd33e837505e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_606ce8258b9ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424009/normal_6006aa55e8ed7.pdfIn PDF document text
    • http://prognoz-football.club/374270821980brth.pdfIn PDF document text
    • http://hookup756.fun/how_to_program_chamberlain_garage_door_opener_with_purple_learn_buttonjmfcp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_605ab5a82caf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5fda02f9168c1.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/53bba2ac-a21d-4772-84a5-9f4f3a1befd3/52022153061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fce1b6-6443-4e84-84aa-3bd7355d3e21/myles_munroe_books_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b641ad63-4434-4a6f-a410-d9182b4321a5/ge_spectra_gas_stove_oven_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0660a9-0109-44e0-99f1-c9ba687e1410/milazakabapiliwumatupemaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80941559-89f4-4590-adde-5aa8046077cd/2012_dodge_avenger_tire_size_p225_55r17_se__sxt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feca134f-5523-4624-88ef-8728733fbaab/can_wahl_clippers_be_sharpened.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bce64a7-95e0-4c05-a856-a419450b4d14/ibanez_gsr200_3_knobs.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/90047657754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588f6d41-9901-45a0-ab73-e2eeacee4d88/what_is_the_difference_between_garmin_lmt_s_and_lmt_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd35c5a-14da-434f-b3e9-28f1875817f2/84958873842.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/88713272235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c86e3e-20d6-45dd-b13a-3932988b1e93/used_club_car_golf_carts_for_sale_in_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c04e934-937a-4fd6-8e6c-d90840e43351/luzepajedusowefivomekaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308cc31b-3183-468d-aed0-895c66909fe2/battery_tender_jump_starter_1000_amp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfd648e-5a75-4149-8abb-d5f0a54f6432/lusoluwuwego.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 5088 bytes
SHA-256: 97c6281d3435b4eb68d9078b281ba94cd1cc0251e6922a073dd12709434c03ac
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 11788 bytes
SHA-256: cd8188ae1ace040404ab2a35dd1fb1a19867066f7156619b7f8f4ae187683e28