Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e6acf8ddde6d80…

MALICIOUS

PDF

162.0 KB Created: 2021-03-18 21:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 45e9413a4bff648e4aacfb6c364a6e42 SHA-1: 49b993058ca600ace6dcbf7246681ac7a2689a72 SHA-256: 57e6acf8ddde6d8030a38bc1f5792ecb68e7a2934a486390b6e2bb5687e154b9
124 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The primary malicious URL, https://pelibifir.ru/strik, is likely used to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=star+trek+voyager+characters+tv+tropes PDF link annotation
    • http://retapadu.medianewsonline.com/how_can_i_reorder_pages_in_a_file.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/rabejebesowijojade.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/0Lhd3jf/soviwuno.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fOPj5CO/modoti.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/gjgg1ic/65197616084.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/pijirogi.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/hieMghB/74056361896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazovugal/nitilowelumokulimaxefat.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/94716775993.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_54fa3494868348b98208a5e0faed14fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/77636762556.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_a0a4def2dd4b4e5d8581d408cd16110c.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_4f26ec8cdfbd468b8085b578bebdf73a.pdf?index=trueIn PDF document text
    • http://buzumigasox.myartsonline.com/54220295718.pdfIn PDF document text
    • http://fixorafusadaxuk.rf.gd/annex_12_icao.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_6b6f3960c2ca4b3fbe828d8352e60115.pdf?index=trueIn PDF document text
    • http://telagivepovadul.epizy.com/fargo_hdp5000_cleaning_kit_instructions.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/11110899244.pdfIn PDF document text
    • http://kugilib.rf.gd/celebrating_success_worksheet.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/when_berserk_will_end.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_off0002652e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2652E 5492 bytes
SHA-256: be1ee81580a49ca005c09d1133f0da59a93900eff14d7fb031168fbcef12df16

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