Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34c502ab6a02ce3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 06:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b845b8110f112cfeb27a02a494571cf1 SHA-1: b76950d859199d6fac7ec3f5f59e4fbd703a60ec SHA-256: f34c502ab6a02ce3fef1ea8b9344a5739d42562907063715ae0c35064a6e7efd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of numerous external URIs, many pointing to disposable domains or link farms, further supports a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://taxfirma.com/userfiles/file/xikagaz.pdf In PDF document text
    • http://probeg2000.ru/files/userfiles/files/lomorelavujadoruduj.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/takatolebag.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///gemotakik.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/89155064752.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5aed06fd957684bb5a89ddc1f793ec8b/24319855215.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jurenu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/guwanodituzifodijal.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/61007792033.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf1147280---52182355855.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/44468335462.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36179751944.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zofali.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210905040822.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/32470894012.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/foduvomi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/jogubulawixukosakaruza.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/98641158705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+java+ui+mcpePDF 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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 16644 bytes
SHA-256: e57b1ff993e9614133d43042d2219c480988dfcc0e8c41011240b72f2d2fe5f0
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 10692 bytes
SHA-256: f6bd073b841714f697a9e562942ccbdaa4066a767dac2a5ec935efbd6b9359c4

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