Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159c7d4cef710cd…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 14:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90ea4e44f7b828e96f23508b01cc902 SHA-1: ae04badd7359544793dc6b93c01e540df414e9ea SHA-256: 2159c7d4cef710cd58222589fe801a86b31ef3f09ce5591e5f26cbda5fa315f7
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. One prominent URL, 'dugedepap.ru/strik', is likely malicious and serves as the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8197

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=best+cordless+stick+vacuum+for+pet+hair+on+hardwood+floors
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f53406a3c.pdf
    • http://trixy-matrix.space/genesis_chapter_6-9_summaryrc0sb.pdf
    • https://cdn-cms.f-static.net/uploads/4380695/normal_601c79b41638c.pdf
    • http://leree6.club/zasonusajazujiwizapouxpr0.pdf
    • https://cdn-cms.f-static.net/uploads/4457563/normal_60200c27eec47.pdf
    • https://cdn-cms.f-static.net/uploads/4481273/normal_603d333f4ab93.pdf
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5ffb46b8329b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kobivimelelo/abridged_books.pdf
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_60bc51ac07bd4029ae1d8a331dfae68b.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/dd_3.5_anti-mage_build.pdf
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_1610624bd71341d7ada497a6d0c58db8.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/how_to_connect_hp_5255_printer_to_wifi.pdf
    • https://s3.amazonaws.com/fisulefajow/retrieve_blob_from_sqlite_android.pdf
    • https://s3.amazonaws.com/dobikasukavu/bu_jhansi_bsc_exam_date_sheet_2019.pdf
    • https://s3.amazonaws.com/medaliwifufugel/ssf2_0._9_b.pdf
    • https://s3.amazonaws.com/wozoxub/hypertension_guidelines_2019_esc.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d4e.bin
3b2289dad1cd4ebdac93b70846e2dcc642f171d5a52b6bfd99ddcb64952646b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 5660 bytes

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