Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a6e282666fff7e…

MALICIOUS

PDF

61.2 KB Created: 2021-02-16 04:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5c92c07ad593d0bf93bf11a62b1f44dc SHA-1: fb2dfa6cc3a361062743f4f85e601786159bd9dc SHA-256: 28a6e282666fff7e930389b1590b9b212a9a9eb760e0cff26ce6745f4f3b63ce
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

Heuristics 4

  • 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
  • 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://druttle.ru/strik?utm_term=advanced+algebra+review+worksheets PDF link annotation
    • https://cdn.sqhk.co/firavibaw/6KijhaE/xugigulojolafima.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/gcGjgb6/faxinelexaxasotunug.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/hepLXcA/naughty_boy_pentagon_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/phcREgg/87087349051.pdfIn PDF document text
    • http://bigno.space/85209704783s3kk3.pdfIn PDF document text
    • http://hookup158.fun/infringements_act_20067bu0v.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/Isiiiij/tom_and_jerry_cartoons_dvd.pdfIn PDF document text
    • http://myyshooop224.site/amd_driver_update_for_smbushfwrj.pdfIn PDF document text
    • http://bigowet.xyz/gametogenesis_mcqfbu5o.pdfIn PDF document text
    • http://merishwheelrecords.com/xatabigexuwarupapimsu3i.pdfIn PDF document text
    • http://dipurenirexo.22web.org/supofetisu.pdfIn PDF document text
    • http://eurozone.pro/6222483437726hux.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/aKAd6Pc/lawubumebinita.pdfIn PDF document text
    • http://prizinsta24.space/natural_science_primary_1_macmillanflw0o.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ijhogc8/first_aid_kit_bandages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotijoxamofos.epizy.com/como_se_forma_aspergillus.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/64082425169.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/android_room_database_view.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/vuriwabimozenunubolupanat.pdfIn PDF document text
    • http://buzurofomurab.rf.gd/chrome_extension_apk_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/r_a_m_ka_full_form.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5548 bytes
SHA-256: 7e5938f19dfdbca88ffcd6be13112cc5c97a1d986fb1669a86636528f5205445