Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbb2bc9acea5545…

MALICIOUS

PDF

77.0 KB Created: 2021-04-26 08:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 47b7f52f13d5606dc942ff3b7c1c4281 SHA-1: 1a9f3302e37e0293d6eca8c60067fa704cee562f SHA-256: cbbb2bc9acea5545d3240cd1d07e6aa21783f90f934cb274e7ece46b4bd3646a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The presence of 'utm_term' in one URL suggests a tracking mechanism for phishing campaigns.

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://leonvi.ru/strik?utm_term=efficient+r+programming+pdf PDF link annotation
    • http://letgtma.bid/steam_turbine_efficiency_calculation0zi6s.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/cwgczji/rimegaxirinunada.pdfIn PDF document text
    • http://yourbigdick.space/jibazunamifodojavv0yxz.pdfIn PDF document text
    • http://winwites.space/eberron_campaign_setting_3.58iiy5.pdfIn PDF document text
    • https://cdn.sqhk.co/fakameratexe/UqcXjii/wojusulikukukatelelulufed.pdfIn PDF document text
    • http://newidowakev.22web.org/11543060928.pdfIn PDF document text
    • http://markettop.pro/vulibenasineloxesaliuo0un.pdfIn PDF document text
    • http://1freedom.space/tojesexerosabebusbhul4.pdfIn PDF document text
    • http://yourdesk.website/13187436619liytp.pdfIn PDF document text
    • http://itabody.space/the_tomb_of_ramesses_vi_piankoffmkubf.pdfIn PDF document text
    • http://changely.club/white_rodgers_thermostat_display_light_not_workingpq179.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/jf0njfU/fruit_pop_art_design.pdfIn PDF document text
    • http://onatural.space/cheap_monthly_contacts_for_astigmatism518bt.pdfIn PDF document text
    • http://sport-stavki.fun/654899368028u327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_25bdc55f8f5c4de29f93d8cc7e645410.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_a0e27f5f02e94026ad246a6079faf980.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4127b6be5fc241a6bbcb52970fa28293.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_ebb954808ae14c35b6af1fcbc9b6dbfd.pdf?index=trueIn PDF document text
    • http://katurew.epizy.com/civic_engagement_essay.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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 5224 bytes
SHA-256: 360883b3b58bbe0afff8b7f7b0a4fe6d85ca237ee274ebde7e79a2eecb67d7d2
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10952 bytes
SHA-256: e33cfd5e346f1ffb981cb4a921472103c4ef297157bfc76bc456acdf6b71fe28

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