Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c7b3f8036121d2…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 05:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae09a6ab614ff130e0b41ec850eb6c6c SHA-1: 2185fe492bd7b30c0fb45ffc9453a61054660b45 SHA-256: d5c7b3f8036121d2f6e44ea65e37a9cb332d9de73e1e730b8bdf5caff986d0f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely to manipulate search results or distribute malicious content. The presence of external URIs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/pbw?utm_term=letter+b+worksheets+preschool PDF link annotation
    • https://bivibonade.weebly.com/uploads/1/3/4/0/134041173/kuzinuxozizetilil.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/7b6ecad.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/toxazuj-jevirojesidu.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/4977917.pdfIn PDF document text
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/caf7e7f0c0100a4.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://xegosigex.pbworks.com/w/file/fetch/144756267/duzawarikip.pdfIn PDF document text
    • http://magesob.pbworks.com/f/hitachi_ac_remote_control_codes.pdfIn PDF document text
    • http://movapog.pbworks.com/w/file/fetch/144731493/2005_cadillac_cts_v_manual_6_speed_for_sale.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/libro_de_espaol_segundo_de_secundaria_contestado_conecta_mas.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/f/latest_gcam_for_poco_f1.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144426267/muginaderomififuse.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/best_lenses_for_mamiya_rz.pdfIn PDF document text
    • http://suxogovexig.pbworks.com/w/file/fetch/144894534/watch_steven_universe_movie_online.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/what_skin_lightening_treatment_do_celebrities_use.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/f/febinogejokasas.pdfIn PDF document text
    • http://najapenoz.pbworks.com/f/get_unlimited_coins_in_8_ball_pool.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144419136/can_you_play_carx_drift_racing_on_xbox.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144623664/66907721748.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/cuantos_capitulos_de_one_punch_man_temporada_2.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/nafibefived.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144473463/rapidex_english_speaking_course_book_in_tamil_download.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/63569307525.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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 4680 bytes
SHA-256: 9847ed574a6a87533d9aa20528ba8925844fe35745329f668a15ac9ee959aee0
font_01_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 10440 bytes
SHA-256: e895a695135475ab3eea18998f2f407183ca1460fa0441cf2055a35619c3b7d4
font_02_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3