Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a0b542194c4347…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccd7066c5eaab541014937243a56f618 SHA-1: 214b2bbb074f01c36a8ddf5d79338ff38a1a74c9 SHA-256: a0a0b542194c4347414ae64ca806771eea0b46888c65ab606ac47e34d26c106e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit vulnerabilities or trick users into clicking malicious links, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://elrey-uslugi.ru/media/file/nakebuxawaxajir.pdf In PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/73248611183.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/82207323077.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210903035154.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/56112997517.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109040000192662.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/29268646901.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/25331303805.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kuliwujefegot.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/37174033228.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/376a6b83cc48b4c5db097f976b04bede/50238776232.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440b7de3773---86535965388.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/siponafibenajetidexokok.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109111959444881.pdfIn PDF document text
    • http://precisao.org/files/files/59155703689.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/38486213749.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dojavifafu.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/49613671900.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sazos.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/fetosofatubepet.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zivigufud.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/91518799440.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/rurejejenivokebim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=learn+r+in+a+day+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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 10132 bytes
SHA-256: 4d1730706187c20c1031c8f3eacd79a1f9b7000b456cf78911c4900c630a6e95
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 15980 bytes
SHA-256: 4bef4e590988e5a127bee3bad5c40a44b2bf1a1a0a359a9506198824a7929bb1
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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