Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf0570626314cad…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 23:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 700a9edb3d7e0c6ccb67973a180b15f4 SHA-1: 326395e3b857522892e4206e95dc50b2d47467ef SHA-256: eaf0570626314cad4c9df90e382d83c8f8e7c58aab13f86b14cebc212a79974f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=ccna+reviewer+pdf PDF link annotation
    • http://ustunongel.com/image/files/98181315727.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/54976413397.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/89681039744.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/faruwovumerijona.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/13214552245.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77484261054.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/68210066004.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/tezinisurotitipinisiwa.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14976093827.pdfIn PDF document text
    • http://becucci.it/userfiles/files/96998331645.pdfIn PDF document text
    • http://futboltotal.net/images/files/bejuwu.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/59080488735.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/3412386480.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/vamaxagizebeporogaladi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/potawuvesepuziwelu.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vasenuvaji.pdfIn PDF document text
    • http://schokozentrale.de/idata/86990238817.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/bukorosuf.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/pinotijotawepa.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/38287271215.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2afil5hf3lgp46307u04fhkp13/31584705426.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/63557696129.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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 18412 bytes
SHA-256: 1f1a027ac72629e1b640a3ec71e060f2bab902e4e40fec248fb935ed17593adf
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 10364 bytes
SHA-256: f5d94c79cade9b14b6ef00c46b24759eb2bc661c576c241660db0ea352b9c5ff

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