Malicious PDF — malware analysis report

Static analysis result for SHA-256 df07a9d29e76c3e0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-22 03:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9dae61a32270c42e5c489bd22948ccb0 SHA-1: 9f09f1110d96d34943f64ff90348250eb6d8754e SHA-256: df07a9d29e76c3e0c19d4742ba1bd0c1f33018647b2049a3fc1be8495b66b4ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to malicious sites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://soxebez.ru/strik?utm_term=can+i+get+osha+certified+online PDF link annotation
    • http://newidowakev.22web.org/27973830971.pdfIn PDF document text
    • https://cdn.sqhk.co/rebosuvut/jBgdgcV/dijifurajovupesarexapapo.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/iajgrid/html_code_play_pro_apkpure.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/branches_of_applied_social_science.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/hglA6jk/86906373769.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/bcb56f8e-3d1d-46ca-be77-a5bc9f7b6c02/what_are_the_basic_movements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0137771-688d-4853-9b59-a53381384c72/what_is_the_best_love_story_movie.pdfIn PDF document text
    • http://rokejunikutigid.rf.gd/31637926049.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/buxivovajubelaranoduxajaf.pdfIn PDF document text
    • http://tesitanine.rf.gd/soxalidonigolova.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_9338ffecce654c83949a7df4468c94c1.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_1fef7e0096da476bb9793ae5813f9b02.pdf?index=trueIn PDF document text
    • http://pejonoma.epizy.com/unix_vim_commands_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bevodukezorobabasazu.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_17afe1981a904014ade99fb520a7e0a4.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_e4cde189f48e4ec7bdc092ee0334f17a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca31eeda-7e2b-4776-92c8-11695aa10334/17919458638.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/programmable_logic_controllers_5th_edition_chapter_2_answers.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_7e35623cb88f474282fd9139c70805b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purufiz/japan_embassy_multiple_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f0cfe8-8380-4077-bd29-7881c2272ed2/canon_legria_hf_g30_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/chapter_7_market_structures_worksheet_2_answers.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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 5188 bytes
SHA-256: 3c430c2fc80bf778a40a4c9c9f0806cff2b1dbbbe27e1a649ccceb47066aa1a0
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 11336 bytes
SHA-256: 970965c65c6a5b4a315d6ebc00daecc5279c253a580e8c6abf770ffe38424666