Malicious PDF — malware analysis report

Static analysis result for SHA-256 3503b76dd16f0a57…

MALICIOUS

PDF

68.8 KB Created: 2021-03-02 05:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f635b50f7e7546067e8c32d680015e2f SHA-1: 1fc2da75a0ffdc463425285c11e592dc8faa24d4 SHA-256: 3503b76dd16f0a57af429042ac46c0794024e562028a0575b361e3a9dcad413e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=samsung+un60fh6003f+no+picture PDF link annotation
    • http://kozidozilujivox.getenjoyment.net/miwowubumeguf.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/56528707452.pdfIn PDF document text
    • http://vorecan.space/d-_day_us_history_definition_quizletvki0v.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/how_much_does_a_cochlear_implant_cost_in_south_africa.pdfIn PDF document text
    • http://iqecoportal.ru/66177193819bn9fg.pdfIn PDF document text
    • http://golosa-spasibo.ru/mokuvixurerakovisofiwuvinqau.pdfIn PDF document text
    • http://yogist.fun/ejercicios_de_multiplicacion_y_division_para_imprimirxo8bq.pdfIn PDF document text
    • http://gufolosolikivu.22web.org/taxabudula.pdfIn PDF document text
    • http://teagreen.space/green_pants_mens_jacket5cw9k.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/33311344026.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/icif3jd/1_dollar_deals_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/jDhgvhh/724_area_code_canada_time_zone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivoganunew.rf.gd/56967808757.pdfIn PDF document text
    • http://wepezip.epizy.com/61195819242.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/google_chrome_offline_installer_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/first_grade_math_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/what_is_a_mri_guided_breast_biopsy.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/99819179531.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/bang_bang_movie_song_ming.pdfIn PDF document text
    • http://zinuforonubas.rf.gd/assignment_powerpoint_templates.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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 5960 bytes
SHA-256: df1e1222f5c025f6f1202efebd0a3bad05900bd9299cece4321724b6dd994d64
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 10336 bytes
SHA-256: cc77dbbc49bf5c85f495c2600c637eda1cec1ace2021403b4802df9f7c8c065a