Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be6efb3b9b4874a…

MALICIOUS

PDF

83.8 KB Created: 2021-04-08 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eab8e357de9ce1ad8f7fdbed80819e83 SHA-1: 1e231b0e98260267ceb26100ea6681fc6b9b3b00 SHA-256: 6be6efb3b9b4874aed098350279a3b6361c108d78c4cbf4f04aa1bdb3fa3651c
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to free PDF downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=cbt+for+dummies+pdf+free+download PDF link annotation
    • http://ufenmac.com/gapitoze9f1qh.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/4140412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_602388d85a65a.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/66904981413.pdfIn PDF document text
    • http://indital.fun/axt_arabic_fonts_free_for_mackyses.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/4421155.pdfIn PDF document text
    • https://potomifor.weebly.com/uploads/1/3/4/3/134332951/5663380.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/mastering_javaserver_faces_2._26touz.pdfIn PDF document text
    • http://idealica-ituficiale.website/mini_rechargeable_digital_hearing_aid_ukm1ve4.pdfIn PDF document text
    • http://lienforkid.com/antrenmanlarla_geometri_1-_2gzeak.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/BjcEhc0/63488395097.pdfIn PDF document text
    • http://mscredit.info/94555398072yxhsa.pdfIn PDF document text
    • http://detonic-de.website/wemaxj7nxp.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/verimivisumegafesuk.pdfIn PDF document text
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/72e1ccfe5bd4.pdfIn PDF document text
    • http://regvoolkim.website/39223042387wxv9h.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/gjrjixt/juvugezib.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/pevuxiporirewosedamelujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_6022639e1b290.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/hmeofSa/college_football_live_scores_cbs.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/lsat_logical_reasoning_bible_free_download.pdfIn PDF document text
    • http://agent-spv.space/degubulemuzovi3jpnp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revudipepofaten.myartsonline.com/report_writing_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 5324 bytes
SHA-256: d5d4653eab7f1fb2a38f64e3323b351dca1f068ab60d24a1d0f36f8337c2b478
font_01_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 10752 bytes
SHA-256: b0ca662db06bacb0cffe143540e15fc533936dbfb65b281adf75596c9e42c91e