Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0a26e26bf88872…

MALICIOUS

PDF

73.7 KB Created: 2021-02-27 16:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25b478e228cfe081ced6e345244cd84e SHA-1: b255fb8516fe04a25dbb9d05b112b22fe13e65e6 SHA-256: ca0a26e26bf88872e574ead23d1a932d4c1dcdfbfc40e857d6ef7339a72cc5cd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of numerous external links and the use of disposable hosting indicate a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=frm+sample+questions
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/papixowufosisuvaka.pdf
    • https://cdn.sqhk.co/fimegasaz/7iaibek/50cc_racing_motorcycles_for_sale_uk.pdf
    • http://venameripuna.22web.org/how_to_pair_garmin_edge_510_with_cadence_sensor.pdf
    • http://yoga-italy.space/kidde_nighthawk_carbon_monoxide_alarm_one_beep61v6m.pdf
    • http://health2health.online/how_to_use_fishing_swivelsxj3so.pdf
    • http://fragcups.com/vedoxojarezi50kl6.pdf
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/xetotaraju-winazijobosaku-wupigokusawexa.pdf
    • https://jemaveroker.weebly.com/uploads/1/3/5/3/135391058/bebazovejupazab_rimokabalilas_tazizom.pdf
    • https://cdn.sqhk.co/pometobab/g1AHjin/private_tunnel_vpn_apk_download.pdf
    • http://jexujililizatub.22web.org/musica_techno_de_los_80_y_90_mix.pdf
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/noxuk.pdf
    • http://avbox.org/60280768128xfnhm.pdf
    • http://torarofuzavu.22web.org/gasuvakip.pdf
    • https://bejazono.weebly.com/uploads/1/3/5/3/135315558/8996688.pdf
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/porarinenezadajim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15d.bin
f95ed9191a6fe1e2f1037220b511a4377bfcfa99fdf4f9caaf18277a883b8c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 5044 bytes
font_01_sfnt_off0000f270.bin
c74e639c197aae8f8fd9be93c178c4042da479a1edd858f6fcb684d5b51eff02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 11708 bytes

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