Malicious PDF — malware analysis report

Static analysis result for SHA-256 125089e5c7a73a07…

MALICIOUS

PDF

79.5 KB Created: 2021-04-27 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 22497b237c8c075b0388cce3037700d5 SHA-1: ea057cea3c789ce998661ef548b9330e03635df2 SHA-256: 125089e5c7a73a07ff791cb0283a3ce7ec45f151202b39f566a473da37f3e1fa
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to link farms or disposable hosting. The primary URL, https://botokaw.ru/strik, is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=cuanto+es+5.2+metros+en+milimetros PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fd04c70c1562.pdfIn PDF document text
    • http://dapunajav.22web.org/how_to_connect_palo_mini_projector_to_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_601ec79caad56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fcbbeacbb7a2.pdfIn PDF document text
    • http://zamividiwido.22web.org/zazezonozubedobisupoz.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/8dc24e4e-7f22-4ba5-9227-5f1d47a72bf3/24703091795.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/work_power_and_energy_multiple_choice_questions_with_answers.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/teaching_english_as_a_foreign_language_jobs_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e76f09-8f00-47b4-b1ef-5cade7929102/xoreruvutalimu.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/mendota_direct_vent_gas_fireplace_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd14d5f2-0e65-40cd-b88b-8a85cb58ed97/interview_questions_for_teachers_assistant_position.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/jisef.pdfIn PDF document text
    • http://pokitudid.epizy.com/nesupogu.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/63188004882.pdfIn PDF document text
    • http://kutavezof.epizy.com/domuzejaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/spray_to_kill_leaf_footed_bug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514719cd-fa26-441f-9923-b8b65c6c4665/bijux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b28c4f-de26-44d7-b892-65e87f7da34b/jozikujepapo.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/55855111728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96a0eaf-7437-4c81-96e9-3caeae268d9c/how_to_stop_photos_opening_in_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecf5093-f620-466b-8c38-d2e16e5e70f5/litojer.pdfIn PDF document text
    • http://bepafazo.epizy.com/pdf_ebook_reader_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 5024 bytes
SHA-256: 51095c4ab41fec2b10a1fcc503e26eab8621e0694355cf67f7a8451836bb6f30
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11456 bytes
SHA-256: e4bf0f89d435aaa13eb81cadcf290f0e14f77c431ed3db827a4fdddb560ff88d
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940