Malicious PDF — malware analysis report

Static analysis result for SHA-256 367c84a7b5bd1d5d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-12 23:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 45f6d1043cf3b12c069590298a05b31e SHA-1: ba4365860ad0c32bf39f4aa56096b882703e9830 SHA-256: 367c84a7b5bd1d5d63bbf619fc83c9158d5ecb1b6e437c7c32c22723de6526a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=tamper+detection+android PDF link annotation
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/42701153707.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/79847823957.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/marenanax.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vipusumijabedu.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/54386591427.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nuzazovepora.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10301987547.pdfIn PDF document text
    • http://aprt1day.ru/file/nubazitifinokuru.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vonutujozewelupotam.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/12759101495.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/95643147511.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/tasipabevadugupobudogime.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/mofolajikexizo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/96921869076.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/16004321485.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexitidejori.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/14475946448.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/guxasexajabitopeme.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/dewononopixusedufujo.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/10584737091.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/bipamarirakigulumituror.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fokedakududup.pdfIn PDF document text
    • https://rippa.pt/files/file/6770807275.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/veloverobumajikur.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xakunonulukewe.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_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 18916 bytes
SHA-256: 8d6d9e8cc78893397c250a1801c0d9362c5f869486e1bb5e354358c74964c994
font_01_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001546c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546C 10424 bytes
SHA-256: 982b5465d52762c6e2cf070e975f60cfea455c922430c6f85199e7edc4f72e78

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