Malicious PDF — malware analysis report

Static analysis result for SHA-256 871f8123b1ffdb64…

MALICIOUS

PDF

74.1 KB Created: 2021-01-27 17:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac7a7373e123e4da7052fd4d6373ca40 SHA-1: 9c4ab6a48e034bac5b9017a43515b28a529535ad SHA-256: 871f8123b1ffdb64c51a3040717e50e4d723f9b303e4634b5862625ae849e7cf
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate an attempt to redirect the user to potentially malicious content.

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://bologen.ru/123?utm_term=android+x86+marshmallow+requirements PDF link annotation
    • http://fit-italy.space/978430005592o0ec.pdfIn PDF document text
    • http://migerov.xyz/battle_ops_wallpaperqzv9o.pdfIn PDF document text
    • http://pagebake.com/the_emotionally_healthy_womaned9en.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/8dgjmAI/zowomib.pdfIn PDF document text
    • http://maykistore.ru/define_planetary_nebula_science_term8cq7g.pdfIn PDF document text
    • http://load-bcp.com/classlink_launchpad_green_bay_area_public_schoolsly60k.pdfIn PDF document text
    • http://tuwuradozanava.iblogger.org/47896985756.pdfIn PDF document text
    • http://liketime.online/shake_shack_stocktonbcxw6.pdfIn PDF document text
    • http://matroskin.space/povenez8oqj.pdfIn PDF document text
    • http://reassurez-moi-fr.info/movistar_colombia_recargas_prepago97g7l.pdfIn PDF document text
    • http://lifeeuro.info/the_culture_of_narcissism_bookykib5.pdfIn PDF document text
    • http://mists.space/russian_rider_online_pcndtv2.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/jfghhVw/hide_and_seek_chinese_movie_ending.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/UgdcoE4/interior_home_painting_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/tjbieih/mushaboom_nova_scotia.pdfIn PDF document text
    • http://cleanup-sale.site/vezogofunojudekagujopny8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/zoxuzibonufikoloxa.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/pazuzatapiluvaroxipebita.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/zatiwelu.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 5688 bytes
SHA-256: fdc5ffa062ae52ed463c676520daacd563953c591da8539b25c1e0ff6aa5b854
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10632 bytes
SHA-256: c7f152afc927d0fe51063b80786f3f63e22a80b3c0bb451fde2f2eff514280be

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