Malicious PDF — malware analysis report

Static analysis result for SHA-256 b659293145f441d0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-03 01:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1f06f359a0b8857cd7b392c33e1759ef SHA-1: 0136b4f9aa5214f66b31b7e1a5acc98086c9013c SHA-256: b659293145f441d0415048b58e38f5583cf2afc393dbcebde69b59331bc1e40e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=intro+a+dressage+test+2020+uk PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/jeghjb5/dude_perfect_overtime_top_10_candy.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/fggaHjh/32938582604.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/apq04lS/dominoes_club_leeds.pdfIn PDF document text
    • http://fufivepibagat.iblogger.org/crystal_report_editor_rpt.pdfIn PDF document text
    • http://pipvip.ru/576988236213wmk4.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/yGLFhbl/tangled_the_series_varian_and_cassandra.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/EIBjec0/history_of_halloween_book.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/lol_patch_10.24_download.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/cuanto_es_un_metro_cubico_en_pulgadas.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jbpiggi/computer_like_launcher_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://befadiw.rf.gd/11211491908.pdfIn PDF document text
    • http://fijetetesozaw.epizy.com/vicks_vaporizer_pads_safe_for_babies.pdfIn PDF document text
    • http://gonefuxirazu.rf.gd/41955321091.pdfIn PDF document text
    • http://wobemiko.epizy.com/bloc_quebecois_party_platform_canada.pdfIn PDF document text
    • http://domuromu.atwebpages.com/vaxad.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/gotepulovefido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 5072 bytes
SHA-256: 05df3caf637694016111ff1236d49e8580b9e158a13abc7240255763cf8c14ac
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 11284 bytes
SHA-256: 4fa3fe60a32fa4a3c4ed89178592492e623bda097767f338d134b40ffe5937cf
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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