Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba79b181e7b31b75…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 23:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e6d01a89ae93489c63eff3cc455068b SHA-1: 3a57e994f7c242452c4525a0e17c27a1ec4c347d SHA-256: ba79b181e7b31b75de55496d1b8989dcbbc4b2fcb907394cf170659ecb29705c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to potentially malicious domains, suggesting a lure to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://thienminhgroup.com/uploads/userfiles/file/25521147302.pdf In PDF document text
    • http://bulmarconsult.com/files/damoba.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/90103851384.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/waloxizagumisekadaje.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/24460337968.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fotifusulororod.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a466f1ff18c981f323d6c07e881e6b5f/wobifapavusuxudokudifafu.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/devijexotebavawojif.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/78515771528.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e45353fed---mamuxupevuzemotegise.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/23974002294.pdfIn PDF document text
    • https://red-adlay.com/upload/files/294805083.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/76956659956.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/83196268755.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/96788640591.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/meravitifipogidaxojobe.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210904104937.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/moxuz.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/10151157620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=only+free+fans+apkPDF 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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 10272 bytes
SHA-256: a02bbec5b645662c2c92f3904f08fd50359eae83f7830a82531cc3e74c44e1a0
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 17340 bytes
SHA-256: b7d388029a00c3d8f40fdf53d66c97097efa9c0c2512b8f58d19be277252114a

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