Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7230f5c8726b30…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57598462618db2e7dade6c411cd691f0 SHA-1: 2327665ed80c1513871531651693d5352105924e SHA-256: 8b7230f5c8726b30836f70d584461da0f1680f5705b1cbbd24a3768a09515cfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on diverse domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://unitez.net/images/newtech/files/logilup.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/10955220698.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/kemaxibexodojanim.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/wadogonesepivilu.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/20961418.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/25d60b18c835b362dfb5f166a6356b47/57232387825.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/63014476960.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/fuzoneliguvuzopinot.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/57046577686.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/88555572125.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/34778123657.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614052a0c6f36---netof.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lususenizel.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/zabikukarivefedudik.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/27641227501.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16315225911660407458.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vebidukidamotirunej.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/bumaraxabe.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/38099663604.pdfIn PDF document text
    • https://halkum.rs/files/78314007877.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/27813863007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+joy+of+clojure+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_off0000ac6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6D 17396 bytes
SHA-256: d87526dfb8c99e198598c2c34f8285aac92dffddc6f8166d92544f09894140de
font_01_sfnt_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10400 bytes
SHA-256: e5efe92fb33973cac37026e3db576d068db3722e71e76fc4b4959ffe9e066c0e

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