Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8b6a614e70152f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 00:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d16753cfb29b877eea33379f4784934c SHA-1: 9ada1663908230a9bae8ef7dd932277307a008b5 SHA-256: ce8b6a614e70152f44df8b49f67f7c89824a047ecb59740a61d02579d2b76877
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document points to numerous external PDFs hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5b858733---jamubakaxav.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/duvugisisipopap.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/susapaseruwuwuxu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/59370297819.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70007841136.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vujiruwarirofufe.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bizubulusugipodesufiwufig.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sexifusizovanofovobax.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/52488630318.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/fefozazaxodukowe.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/34248828298.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/dolevozike.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/varapemomuperawisugese.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/waxekovuru.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/rapopilevajadepapejote.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/lidogegirezaluguxipi.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/8216218630.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sabegutovaromexupebij.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/88038169225.pdfIn PDF document text
    • https://tekartltd.com/upload/files/78323502488.pdfIn PDF document text
    • https://beautydent.hu/editor_up/27181341620.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/juvikixovuwoxideripog.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/76606087953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=edgar+allan+poe+the+oval+portrait+pdfPDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 10656 bytes
SHA-256: 02bd89940c1dc957c0804d64ecd2d4fd283d0fdb114e51aa2fdac570c4873d05
font_02_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 14608 bytes
SHA-256: d6861595aab89f99aa4f817f5ae5c315144695f6272409cde8433c3d170d4a00

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