Malicious PDF — malware analysis report

Static analysis result for SHA-256 50584aae32b8ff77…

MALICIOUS

PDF

70.3 KB Created: 2021-06-06 04:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b6d7ec4ecb51589fb9154c0e02a0ea SHA-1: 4e3c8e27d051580613039faa0822c0f8b9b92273 SHA-256: 50584aae32b8ff779f339ad63faf0fa4299db588064b4ed568197c3c16a950bc
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to distribute further malicious content or phish for information. The presence of external URIs and the link farm structure are indicative of a phishing or malware distribution campaign.

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://laborke.ru/pbw?utm_term=handwriting+paper+for+kindergarten+printable
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5fed5e864d06f.pdf
    • https://cdn-cms.f-static.net/uploads/4487903/normal_603254ef73ccf.pdf
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5ff03c6e99871.pdf
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ffa01047e035.pdf
    • https://cdn-cms.f-static.net/uploads/4374519/normal_60331a4b945c0.pdf
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fda8982b4775.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601b6650ce413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sujagajo.pbworks.com/w/file/fetch/144696783/72537933554.pdf
    • http://nalujoxerisi.pbworks.com/f/68735456972.pdf
    • http://refarumiba.pbworks.com/f/formula_de_media_aritmetica_para_datos_agrupados_en_intervalos.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144475554/physics_textbook_for_secondary_school_in_nigeria.pdf
    • http://duziruromeja.pbworks.com/w/file/fetch/144499131/cosatto_footmuff_washing_instructions.pdf
    • http://palejemevat.pbworks.com/f/how_does_napoleon_gain_power_in_animal_farm_quotes.pdf
    • http://pugaxigodaka.pbworks.com/f/how_to_reset_error_code_on_rinnai_tankless_water_heater.pdf
    • http://jozeluwofe.pbworks.com/w/file/fetch/144418794/47384843693.pdf
    • http://didaneguk.pbworks.com/w/file/fetch/144427413/41497457766.pdf
    • http://wuxikadafi.pbworks.com/f/what_was_horus_the_egyptian_god_of.pdf
    • http://mukonisu.pbworks.com/f/oraciones_subordinadas_adverbiales_causales_resueltas.pdf
    • http://xuruzinijub.pbworks.com/f/9360691852.pdf
    • http://mevuteled.pbworks.com/f/how_to_insert_two_functions_in_one_cell_in_excel.pdf
    • 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_off0000d4ca.bin
080fc751faf1e6f61d50251053b5c7622171ece910d59ec555ff3edfa7d57f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 5288 bytes
font_01_sfnt_off0000e6ea.bin
67dbf2707ba5522778bf1ff33d3bd4aa438f6bb1bb5f41ede0f357323b22cb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10748 bytes

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