Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a416222a921bf6…

MALICIOUS

PDF

73.8 KB Created: 2021-04-10 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 742acfe0d15f2aabec1738e9beef84df SHA-1: 68f38f7d77ada251fa28ee0f7823de950da1e373 SHA-256: c9a416222a921bf620a713d3bf6960f9475d75c4c610af907e1a8cadeb512f2b
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are disguised as PDF files, indicating a link farm designed to redirect users. One prominent URL, 'https://dugedepap.ru/strik?utm_term=how+to+replace+power+steering+pump+on+2006+honda+civic', is presented in a way that suggests it's a search result, likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

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://dugedepap.ru/strik?utm_term=how+to+replace+power+steering+pump+on+2006+honda+civic PDF link annotation
    • http://gijixig.22web.org/anaconda_english_movie_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_605baa00286cc.pdfIn PDF document text
    • http://50off.pro/how_many_parts_of_fifty_shades_of_grey_are_thererfkdt.pdfIn PDF document text
    • http://gloslides.com/93324083259p1jfo.pdfIn PDF document text
    • http://taher-tcac.com/599368178003k0qm.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/detosimawopo.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/38671283356.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/beginning_middle_and_ending_sounds_worksheets_for_kindergarten.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/kepepaf.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/13734550530.pdfIn PDF document text
    • http://kawibijew.22web.org/xolakajusapujulugisigega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_605fa0f5154b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapojetudijo.rf.gd/already_just_yet_ever_never_exercises.pdfIn PDF document text
    • http://rurasikawasup.epizy.com/perdona_si_te_llamo_amor_2008_descargar_mega.pdfIn PDF document text
    • http://vemameb.epizy.com/linksys_wireless-n_range_extender_re1000_setup.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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 6028 bytes
SHA-256: 646122b64e0d6ca6173686a8f0bfc6048ec49d1327d91a7b6127bb5b55f227a4
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10224 bytes
SHA-256: 257fd1a536fbc9c104ec6a8bdb47c8276352abb09bcb7e04c2ea336f07d7535d