Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb61f9a5208abdb0…

MALICIOUS

PDF

80.0 KB Created: 2021-03-06 12:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5a4af136412ff12579a837d0342c86e1 SHA-1: 94119d01ab7c014488146c52b56363b58e9e6e13 SHA-256: cb61f9a5208abdb095036b7d40fae6e2af6e8a6e13750b32285bb2a8facf8de8
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xajibur.ru/123?utm_term=triangle+congruence+worksheet+sss+and+sas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453537/normal_6031429137eca.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/vijibhs/the_crossing_church_quincy_il_live_stream.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/watch_twilight_online_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_602f9c34b8475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_601d42cef0894.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/xivalud.pdfIn PDF document text
    • http://portkamesto.site/nibufokopoxe6hy4l.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/ninotuseselelabanis.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/gg4pgcb/fimasoralomomowamug.pdfIn PDF document text
    • http://reduslimitaly.website/samsung_j5_pro_vai_receber_android_9sci1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_6042193911a1d.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/7ihjb7j/fijivixazumubuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/96jcOIB/1787776821.pdfIn PDF document text
    • http://puwisagoki.22web.org/jifaxovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5fdb3483db05c.pdfIn PDF document text
    • http://magazok.top/muvijiniwc6iq.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/rosopeb.pdfIn PDF document text
    • http://obzorov.site/waliniforozypeci.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/pamefozelodadegoni.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/ihgiibT/real_football_games_download_2019.pdfIn PDF document text
    • http://mantenancie.com/pop_piano_sheet_musicukufe.pdfIn PDF document text
    • http://pevetune.66ghz.com/authentication_problem_wifi_android_mobile_solution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davagutuvis.rf.gd/hd_movies_premium_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ef36b2-1985-407d-9e4b-32bab9b5701d/buxiwidanuzewuvamewuweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8094dced-10f6-4a7f-9b99-f5d9a2803455/dobemoxaxumunovuzibogaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c0d393-6ff7-4350-8674-2a56edf8bb88/21869061116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ab04ee-e6e2-401c-a828-61c0ce18feb5/90522956807.pdfIn PDF document text
    • http://xesujenomudot.epizy.com/darksiders_chaos_form_controls.pdfIn PDF document text
    • http://zunimesigo.rf.gd/jeremuxokogefutokap.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_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 5308 bytes
SHA-256: 2e1b7c776780dd902f207d53d1db450b82e4ed538d62612dc9b000d69e770fdf
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10784 bytes
SHA-256: 7f255886fe5429da64a6a393c8838461c69e71e8f3cab35d48f2abdbce0b5fcd