Malicious PDF — malware analysis report

Static analysis result for SHA-256 122fc8a7487ed579…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 11:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bfe1c39ae14f35e04d8a3bf530b2d4e4 SHA-1: 4d9a1edb6236310cfdb242fe2f804063f6c6ee4f SHA-256: 122fc8a7487ed57914f1e17edb9fa96ca92fb8ec965de18bab76aef41f4ab90c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://benrassam.com/uploads/files/texopuwegulasapuxu.pdf In PDF document text
    • http://guowangcable.com/d/files/foxixinexilosutetibu.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/wonizaj.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/pewazoza.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/nemexuwonunapulupu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/27977207572.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///99897845323.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xonidisolazu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/11258245215.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32631364520.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/mekalujevifux.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/najovafoxex.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/fomivabat.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/busodur.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/zidudixexebuvadimegip.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/3068703371.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/bubatitafubidadudejos.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf114ea49---86475789255.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/tosugon.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/1704020745.pdfIn PDF document text
    • https://virker-ikke.dk/files/palezagisobobudezuniw.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/kolelida.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/65378966234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=material+notification+shade+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 10652 bytes
SHA-256: 4be733b9bb044ff769e5ce4560ba469aafb81d1d94b6cbb6b1e69c757c903624
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 17756 bytes
SHA-256: 118ba95fc8ed0a134973eeaf1ef5670a4ea2dfbff9e68f817f978ac6b9b0e168

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