Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a944d4b96c710c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-24 12:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 265696703fc73e832e367f913aedb96e SHA-1: a172cf0bec201edf88a1b8c4556488a37ba95213 SHA-256: 25a944d4b96c710c3b0f1423913a32528ff809da4aceed5cad88b75b0b364930
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=the+miseducation+of+cameron+post+trailer+ita PDF link annotation
    • https://cdn.sqhk.co/daposofoxig/vjhihVz/70899527981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60474b9731301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_606538de08873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fda85a456d13.pdfIn PDF document text
    • http://suruwafid.22web.org/laporan_pendahuluan_bronkiolitis_pada_anak.pdfIn PDF document text
    • http://sibobovogulumu.22web.org/yonder_come_day_satb.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/jemoxabijufej-kinajoga-tixemuwetebiji-puvibabixu.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/agjggk6/kebufaloj.pdfIn PDF document text
    • http://milukiwidawedej.22web.org/gilolowo.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/E5mhdjW/merge_gun_shoot_zombie_apk_android_oyun_club.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fcb68a889fa7.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/20419296d760803.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/gyggp6c/98998078901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_107d173c0247449c8112d0e44cee87b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cecbe9e-c56e-47fe-a06b-63d778cc016e/how_to_change_font_size_on_brother_p_touch_pt-80.pdfIn PDF document text
    • http://fodiragotisaka.epizy.com/trinidadian_teacher_killed_girl_in_jamaica.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_e4b88d76fd7646b682f9a03fa2fb75c6.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_62cfe0a6927642d49f4e2c36cde67a8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cf848f-18d6-41be-ac9d-872da4911398/xupijaxituziwos.pdfIn PDF document text
    • http://tevomare.rf.gd/986602529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5957f398-e10c-44fc-b008-4676dc3cf912/noco_g15000_review.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_94bc25d3741c4177bd839dd4dcc71ca1.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f7ff26b7744e44e1b77fe0c02528743f.pdf?index=trueIn 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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5344 bytes
SHA-256: 77bcea041b02d7c19388f3ad1d36fd9b3349f9e2b0aa559767b9270a6fccfcd6
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 11200 bytes
SHA-256: e4e3ab3e94a985b7acbf57ec5ba15a591449f30b376d01ae21cb021874eaf183