Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8789b75b06bb7fd…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 19:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c4e11bb61d0d2d66f7c92ee2ed902c4 SHA-1: df06ef2814d64657752e73c53de7cdebf46f283a SHA-256: c8789b75b06bb7fd8d51c2f09d3b340f477f759e586172d49d338c4e7cbf9bdf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'business english words', directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wb?keyword=most%20common%20business%20english%20words%20pdf PDF link annotation
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/6726730.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/I7hfMhi/change_my_giffgaff_voicemail_number.pdfIn PDF document text
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/zozavef.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/a5ff91f837fac5c.pdfIn PDF document text
    • http://benosetib.iblogger.org/tesetosaxanuxavozutug.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/lTHGRjh/swepco_outages_in_louisiana.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/hfuL1ie/zombeast_survival_zombie_shooter_early_access.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/dhiVyZ6/royal_caribbean_international_cruise_ship_jobs.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/sinamozagemoger/83097491621.pdfIn PDF document text
    • http://darotevu.rf.gd/curso_de_mecanografia_en_espanol_gratis.pdfIn PDF document text
    • http://simifumujabiguw.rf.gd/bimixogiwigu.pdfIn PDF document text
    • http://magotabitujotu.rf.gd/7250540320.pdfIn PDF document text
    • http://waxivapisisan.epizy.com/techfire_hbs_730_how_to_use.pdfIn PDF document text
    • http://xonesopidazuju.epizy.com/94339505173.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/67169656345.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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5596 bytes
SHA-256: c25c1b321747ff4a8a5b63db1a4807cc29b5f83aebef1783551cfa4d3158ec72
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10044 bytes
SHA-256: ac424486670bf94284d93da661278c1b60032a2fc9c6ef11e725588d07c40cf8

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