Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9b6ffb620245e…

MALICIOUS

PDF

73.6 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: 91cec4cbc517cc6febf787b73e1d51ef SHA-1: a2e12d7a89c35f9648723028069542528a909caf SHA-256: 79c9b6ffb620245eede6353ca758e42eb16a8f3a18588f6506d17bf2b98a769b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://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://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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5548 bytes
SHA-256: 7e5938f19dfdbca88ffcd6be13112cc5c97a1d986fb1669a86636528f5205445
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10468 bytes
SHA-256: 4f3bc462dd4ea5bf7f7bd58e97d75f4364a38ea8871dd170f672899d767d7cfc

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