Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fcf97c5997172c…

MALICIOUS

PDF

74.3 KB Created: 2021-06-02 08:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0533550417260bc988363726136a368 SHA-1: 508f6b925a472de8d7b141e6ee73a825d65f9c58 SHA-256: 55fcf97c5997172c1249e58d76710902e1e69dfcc95c30b55e2e4a31307c5309
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 0.9997

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://catamma.ru/pbw?utm_term=star+wars+comics+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fc9eaf099492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_60403afa0ee14.pdfIn PDF document text
    • https://duxuremi.weebly.com/uploads/1/3/4/6/134623812/megokeloki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5fe47007cc608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fe712e87020a.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/zabelewo_xemoradisefi_xajesefidowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5fcb4742d8881.pdfIn PDF document text
    • https://jenogadagebaz.weebly.com/uploads/1/3/4/5/134586404/a9bea9ca0a4e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_60253ad921f16.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/e55f1dbe-a915-4ff4-b700-d5a5fc36753b/guporuridesinorure.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/best_little_wedding_chapel_in_las_vegas.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/pdf_roll_of_thunder_hear_my_cry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cf332f-d5c2-4f85-922d-5a0ef3ec0662/el_mito_de_la_caverna_de_platon_ensayo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d521679-63bb-4a5f-9a67-30c7e7f0594d/why_is_the_short_run_aggregate_demand_curve_is_upward_sloping.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416091/vudojomapibonopes.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/solving_quadratic_equations_worksheet_all_methods_kuta.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/binejituwekedomorafaf.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144492582/the_legend_of_zelda_the_minish_cap_nintendo_game_boy_advance_rom.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414495/82554640604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdf7770-31a8-4388-8668-07681304aea1/resumen_del_libro_el_caballero_de_la_armadura_oxidada_capitulo_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd651527-6a61-4adb-b7f9-cb6d6923497b/electronic_control_fuel_injection_system.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5464 bytes
SHA-256: e2099d175154b1116cd481b4b60b29f48dc98577b0f23799b0e4ef7cc99ee394
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 10956 bytes
SHA-256: 23507ddf81b50f8edcc20b2a83f911ad0a4586f4edf8c69dff85975ab79f2576