Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7224eb26e57177…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 18:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d195a23441d22f716b109c062a61bd99 SHA-1: b1f034d1ba55912203a8eb90b634844b511bb545 SHA-256: 6b7224eb26e57177c8cc198a997c9590fb86123e3eec4280c686b302ad476f71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=linux+programming+interface+book PDF link annotation
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8637216727.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vematuxet.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/vofanujaferesa.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/86557041743.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/78420386693.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d3df36d---tisujovofetowuzalosazexe.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/bazabuzo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/59094120463.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/kevedudututal.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/15065638444.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/10428299441.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/37744018268.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/98841346811.pdfIn PDF document text
    • https://panoramabyty.cz/content/levagoguxifi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xikafusaxewulabapik.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210904070253.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pafanavefozap.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/zuliletebedalamib.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349f9106fa1---82363247124.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/44059798504.pdfIn PDF document text
    • http://laserinnsbruck.com/static/34560225313.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://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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 11000 bytes
SHA-256: 0dcfe4495926a9916ac0e82663b528ad3ac467c4172b39f29d2b9e4f05093026
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 17492 bytes
SHA-256: d2e8c3c8542a0f6025e5bd62c59553f964b2e7136566c7b27c2d653a0005fa2a

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