Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ce2633579224fd…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 12:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e9f9f1ec7c82053ff9fc8c93df2dd146 SHA-1: 4fb3cccc9b73d090060b589d9d65cfb753e2c207 SHA-256: f5ce2633579224fdb9d261c1fdaa514d4f6528faaf40fe1a1569c32e2463ec09
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=acft+workout+plan+pdf PDF link annotation
    • https://cdn.sqhk.co/vipujitebiki/c2sjBje/jenazu.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/ejdgdBB/old_songs_60s_70s_80s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_600049b068ad3.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/generic_weekly_calendar.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/32871753580.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/how_to_become_a_prosecutor_attorney.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/hdhg822/cbest_math_practice_test_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6031acdf0f8ee.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/cnLe4id/relojopone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5fd955dd18abe.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/XibSghq/zatonusasugoganik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_6003980641e5c.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/vuzuxidarofagujewirisis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7caf1d50-5fbd-4e0c-a90c-5565f236485d/39233021003.pdfIn PDF document text
    • http://rabelame.atwebpages.com/psychology_book_by_nagarajan_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369ae0e8-73a7-48a1-baf4-d1c0f6d77794/how_to_update_my_garmin_nuvi_255w_gps_for_free.pdfIn PDF document text
    • http://vabagez.rf.gd/buxuzisogigup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe188ad-6485-4e7e-90c5-0d3fc61f57be/60817408233.pdfIn PDF document text
    • http://xinadapobeloj.rf.gd/39542826955.pdfIn PDF document text
    • http://fokerek.epizy.com/49891918496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb704f1-135d-46bf-b5be-2be946df0b33/14423224135.pdfIn PDF document text
    • http://bobitemobo.epizy.com/11896774042.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5116 bytes
SHA-256: 6f47ad9a51fa57e1d9e3e750dc154cd6575c482a2e28407fe3f4fcbe68a905df
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10792 bytes
SHA-256: f5f729b5ca7dbff30a5bb9cf24c9026958bcb33bcabbbeceb2b35e4b3c124003

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