Malicious PDF — malware analysis report

Static analysis result for SHA-256 858c7c4fcda874f7…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 11:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b19e2a765ef08f06e56390d1034ec5ca SHA-1: bc4e62c542750fa4a9af3c5e0a015de303ad6426 SHA-256: 858c7c4fcda874f7dc824fce5ee423c028c8977abe17954ebfa962687359061b
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution attack pattern.

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://leonvi.ru/strik?utm_term=english+literature+classes+near+me PDF link annotation
    • http://rastet-malysh.ru/tujibaxutajetituvmcv2.pdfIn PDF document text
    • http://mewebewenuzotez.iblogger.org/84006056233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6026944673011.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/jhifTWP/33285945121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413702/normal_5fcaa867afba9.pdfIn PDF document text
    • http://lovechat24.club/t_mobile_visual_voicemail_app_iphone33d5l.pdfIn PDF document text
    • http://sewasapeko.22web.org/carry_on_jatta_songs_video.pdfIn PDF document text
    • http://uniques.space/1965874920154pmk.pdfIn PDF document text
    • http://forpost-electrica.ru/download_slither_battle19s4c.pdfIn PDF document text
    • http://idealsit.fun/what_is_a_derivative_for_dummiesiyyep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601da5971aae6.pdfIn PDF document text
    • http://pagebake.com/58579974125j3hcp.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/dgggbig/93511079629.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/p9Oiiig/2020_college_football_rankings_predictions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipakixulo.rf.gd/aambala_movie_songs_masstamilan.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5172 bytes
SHA-256: ba76fc6a313e152b6faa71633e903be4c576b24f538069e7143e0722e28c3fb7
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 11180 bytes
SHA-256: 81875b196bc9d3b1faf854928f45b30543c1448719872bca342a32fa441d542b

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