Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e74f9be5ec018…

MALICIOUS

PDF

67.8 KB Created: 2021-04-04 09:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3599116fa6828e3b0cb4e4331183cce0 SHA-1: c234df905d7effce1176a63a2bda72b3c93238c7 SHA-256: 778e74f9be5ec018d8798e174d9f6a414bda259567055ca5066908a40b9367fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier output confirm malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=meyer+e47+motor+brushes PDF link annotation
    • https://cdn.sqhk.co/barosevarega/fRtOtF0/84347486126.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/fgjgcge/jasper_report_java_version.pdfIn PDF document text
    • http://italystore.pro/tifemuburuvi6ddjk.pdfIn PDF document text
    • http://pressit.fun/kuzesubanimosutugezoweeiq0z.pdfIn PDF document text
    • http://icily.xyz/five_night_freddy_apk_gratisu95i2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60114d0488554.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/dggGpkp/idle_breakout_hack_code_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/bgg1WGp/booboo_stewart_x_men.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_606585b5f2b21.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/y9jOgdJ/37386458545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5fe9c78d96ef2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furipurisebete.onlinewebshop.net/developmental_psychology_childhood_and_adolescence_9th_edition_download.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/wing_chun_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb07dd2f-4eb2-468d-8869-7fbc3fee105f/the_game_plan_2008_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af7ad72-707e-4817-a143-eae4fc850147/19912990528.pdfIn PDF document text
    • http://zowabito.rf.gd/how_to_write_letter_of_recommendation_for_phd_student.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/how_does_99_year_lease_work_singapore.pdfIn PDF document text
    • http://godidab.epizy.com/accounting_cash_book_software_free.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_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 5100 bytes
SHA-256: 837998d1ad6d52c79c674bd335af20febee4a2a9cbd477bd949e6b71b71f9f44
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 10364 bytes
SHA-256: a98ab0a4ce272afa5aa594371e8bb42d3a887b9e677b49028029a848a25eaf95

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