Malicious PDF — malware analysis report

Static analysis result for SHA-256 9919f8cb37a7c4c5…

MALICIOUS

PDF

71.1 KB Created: 2021-03-21 00:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d0ce76821789297c8006bad387db9e84 SHA-1: 4b143986f504a375147bda0640f951bed7985f20 SHA-256: 9919f8cb37a7c4c58cfa38a924e253b856af98a703c4bb4d0b63d6b467da82f5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=2003+bc+calculus+multiple+choice+pdf PDF link annotation
    • https://cdn.sqhk.co/bareziwo/hnQigjf/spiral_ham_instant_pot_pineapple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_6044752001ac7.pdfIn PDF document text
    • http://hayatevesigar.online/what_does_the_yellow_lightsaber_mean_at_the_end_of_rise_of_skywalker76nvw.pdfIn PDF document text
    • https://cdn.sqhk.co/gusejemife/z8yzja2/anasuya_malayalam_dubbed_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/ojjgetG/donadofukeg.pdfIn PDF document text
    • http://gooddevice-online.com/el_diario_de_greg_3_pelicula_completa_en_espaol39394.pdfIn PDF document text
    • https://cdn.sqhk.co/zubafena/tjarUig/flipping_a_coin_probability_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_6015a3e480e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_601b1953dcee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_600f1e6291a55.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/didjexY/kabove.pdfIn PDF document text
    • http://mon-fortuneo.best/how_much_does_it_cost_to_ship_200_lbsgizhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_602b4311b3b67.pdfIn PDF document text
    • https://cdn.sqhk.co/sufiwotag/iage9jf/lurizosegifudoj.pdfIn PDF document text
    • http://lerob.info/zizowotenojeldl70g.pdfIn PDF document text
    • http://tramlaweq.online/zuxokagimivokejepoxetuozuic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_60450d055078b.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/76de3cec-5eee-409b-a919-767c8c740d84/how_to_use_a_youtube_video_as_a_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f234045-15a0-4514-bd3d-73c6a703be1c/hoy_seor_te_damos_gracias_por_la_vida_la_tierra_y_el_sol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5a6633-4348-47fb-9ec6-f17e90e19976/summer_infant_monitor_in_view_2.0_how_to_add_camera.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 5784 bytes
SHA-256: d700d7c0f86ccef2e568056e5b156a69da8fcab109d9d2530e098f2856d9e768
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10708 bytes
SHA-256: 983b5643796a0887e94f19d0c487df74e67892c32593dfd8e4d297af21567c08