Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a094a41b88e41ca…

MALICIOUS

PDF

75.8 KB Created: 2021-04-23 23:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d776ff19b83a6cf6db6c3911667662 SHA-1: 7bf9089acc04ac54bc893c715a851b8c0095faba SHA-256: 4a094a41b88e41cad0e856321a7f9968f1f810889ff58a650f25276eae841cc0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan delivery mechanism. The presence of a link with a 'utm_term' parameter suggests a targeted campaign, likely leading to a phishing page or a second-stage malware download.

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://jacksth.ru/strik?utm_term=hp+psc+1315+paper+feed+problem
    • http://ranking-se.com/craftsman_laser_trac_3_inch_circular_sawrzw0t.pdf
    • http://fobexugelego.getenjoyment.net/how_to_reset_taylor_digital_food_scale.pdf
    • http://silekutum.medianewsonline.com/gexederapoxisik.pdf
    • http://itdiscounts.pro/volar_sobre_el_pantano_descargar_libro_completoxsidi.pdf
    • http://nusowutevu.getenjoyment.net/valores_bursatiles.pdf
    • http://sunazeremitiwu.mypressonline.com/nogipurobaximolog.pdf
    • http://lololoj.sportsontheweb.net/bamugaxudukejelokawi.pdf
    • http://openchambre.xyz/onan_7500_diesel_generator_service_manual5j72q.pdf
    • http://circleshtang.xyz/hmdx_jam_classic_manualmgdy2.pdf
    • http://palawawez.mypressonline.com/anemia_microctica_e_hipocrmica.pdf
    • http://sunny-web.ru/honda_gcv160_pressure_washer_pump_diagramcxxeh.pdf
    • http://trysoda.pro/degisoloxexoruwovezez21pfk.pdf
    • http://francobusiness.com/korean_alphabet_with_english_translation_and_pronunciation5xq1r.pdf
    • http://musofiron.ru/cover_page_photo_template15ygm.pdf
    • http://idealica-official-it.website/jubojisusorekabivutikoh2bi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luworizesupox/binary_to_decimal_conversion_method.pdf
    • https://s3.amazonaws.com/bagisi/unconfirmed_report_means_in_ecg.pdf
    • https://s3.amazonaws.com/mupukesunobaga/880699083.pdf
    • http://redifigikutusoj.myartsonline.com/xesatomonegafawujojez.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_off0000e995.bin
6cec99c37562c715c590c1a7138fa55cfbae65ba16c9ee707852df29be105f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5740 bytes
font_01_sfnt_off0000fd13.bin
eed78a224f9fe751e0ee949566301d080b6f56f8d2b444fafa3f6b7f85565ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10948 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.