Malicious PDF — malware analysis report

Static analysis result for SHA-256 a797b1d034717e3d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 18:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c97a654a1027c9c9a5550ba9eeec9045 SHA-1: 8b07180981f92b0c9cd8d060d9de32b38cecebb1 SHA-256: a797b1d034717e3dc7a0f9a4bb3ba271debd7528e43dd5cd1da9d096319647cf
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a spa sensor, which likely serve as lures.

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://dafemum.ru/strik?utm_term=coleman+lazy+spa+water+flow+sensor
    • http://lezofifividex.scienceontheweb.net/definitions_of_education_by_different_authors.pdf
    • http://pipopituga.22web.org/91085741423.pdf
    • http://janetoxanonim.22web.org/notarisemukewomedanirel.pdf
    • http://proita.space/steep_trophy_guidekiypp.pdf
    • http://7lessons.website/95595366109nlpek.pdf
    • http://xigegojaliku.iblogger.org/raxasiliwusabore.pdf
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/5991a05e1.pdf
    • http://blacklaser.ru/cyberpunk_2077_release_date_postponedxgzro.pdf
    • http://vuvopogawuxaxax.22web.org/jll_valuation_report.pdf
    • https://cdn.sqhk.co/xuwolupenilu/hgBbVYh/top_100_radio_station_near_me.pdf
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/3967898.pdf
    • http://servempieza.site/how_to_animate_on_ipad_photoshop_layersj5fa6.pdf
    • https://cdn.sqhk.co/dodirijobadi/hjhh5hg/auguri_anniversario_matrimonio_formali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lakelasu.rf.gd/how_to_unlock_android_13_xenoverse_2.pdf
    • http://wobadumiravolu.atwebpages.com/descargar_libros_de_mary_balogh.pdf
    • http://xupudajiwozov.epizy.com/glitch_photoshop_template_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edde.bin
b22f465d02b39d592fdd9b9376b04fb6e7a56549bd54728a2e2273d960ca3230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 5052 bytes
font_01_sfnt_off0000ff13.bin
521f8effab557a71c34fef478b55164c1c6cc999645b270560c31a1fc4ea17d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10784 bytes
font_02_sfnt_off000123fc.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 4324 bytes

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