Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0478a2caf82c9bb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 15:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 614b14cce048836bd5b39399d40cdfd0 SHA-1: f103ab7144ec5a00846239b7ded4c21f19001b0c SHA-256: c0478a2caf82c9bbc0082737c4c122d10f33bb4c4e4a2cc0e0f7bc599780f35e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://duocmyphamcongty.com/app/webroot/uploads/files/54561393492.pdf In PDF document text
    • http://kdwatch.net/upload/files/2021090908491970.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/87287814996.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/wadufobisub.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/dixutubeforerikagetebot.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/42197565059.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/69241600562.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/momakadimowomej.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/molag.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/45214564700.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kusemeg.pdfIn PDF document text
    • http://delve-cr.com/uploads/72994414569.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/83431007689.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cfeedc7---kotuxoweredesefivesusutu.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/60105456799.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/gususafobunavag.pdfIn PDF document text
    • http://gazetavk.ru/img/file/morudononimutoxori.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/60862335874.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091104101773499.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4cebfb71---64803060228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=voice+call+vs+facetime+audioPDF 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_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 18828 bytes
SHA-256: 89900b0e7bf1a61d446a2b5056f896e77a75410c708c89522a4eb392870e5b8b
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10568 bytes
SHA-256: d88461ed888ea95bf1948698c7eb4a62ec38e73ef361bfe38c25031a1c3222c4
font_02_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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