Malicious PDF — malware analysis report

Static analysis result for SHA-256 50040fe2fdf1a022…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 15:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 933601f9c45d56e3eb65fd1f0525b734 SHA-1: 21cafb4d86cfd7611aa6c3c2c06fc1099bb5577c SHA-256: 50040fe2fdf1a0225e3d4970f07d7eb60725ad4da28fceb3d635bd2e324bbc46
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=can+f+statistic+be+less+than+1 PDF link annotation
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/7181454.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/hIYCigF/can_contacts_change_your_eye_color.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/cUDjghg/fast_food_chef_cooking_and_serving.pdfIn PDF document text
    • http://brandframeb.com/astm_a105_standardiri3g.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/5153367.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/jspdf_base64_image.pdfIn PDF document text
    • http://sreda.city/how_to_watch_movies_on_sony_xav_ax5000vclop.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/interpreting_and_analyzing_financial_statements_6th_edition_solutions.pdfIn PDF document text
    • http://lifegirls.site/biointeractive_photosynthesis_student_worksheet_answershl3vv.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/7hjjejh/wirorudewivoletumuxu.pdfIn PDF document text
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/wisiwufiwodoxin_xoraketexupened_xugozusisob_kokinetumufozeb.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/4288151.pdfIn PDF document text
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/titotelereso.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/jaMpzFp/teacher_assistant_salary_scale.pdfIn PDF document text
    • http://canonsburglake.com/wagulijobodasufikutugweq9c.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/Dnjb1je/black_friday_2020_walmart_ads.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jojulupijawide.onlinewebshop.net/43774892262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d5730b-f6b6-403c-a632-a1aae69e862f/kuwovemafutosot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccd5190-e42a-4d37-88a6-b277cafe6b85/75685732933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbb1b67-d5e3-4a8b-8e66-622dd9f7a2a6/xamavuzuwokixamawepi.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/29810216202.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/carrinho_de_rolim_projeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6beca8-184a-403a-a2dc-db4561563146/firezatudodogatekivife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb94c3b-089c-47db-b6a9-4664cd0aef10/satifaxuligoz.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/best_ebook_reader_support.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 4764 bytes
SHA-256: 0e8f3ef248e7f6bc810d84e9bd78dec573b709e73638e6e68f66e53b9fb0f8f8
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10848 bytes
SHA-256: 442850b566092f8ef709d54e88a4b2dd28f3663922813de82d7392bc55ab0c19
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3