Malicious PDF — malware analysis report

Static analysis result for SHA-256 020c0f765d2865d5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 02:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a66cb921b5bf958a6898645efcbabce8 SHA-1: abfb8c927375aba5a098684df8b36253d2581b53 SHA-256: 020c0f765d2865d5ccd2afcc8e6cc330b015a59bf3efe55e6d977a54dc0824a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution scheme. Although 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 0.9975

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 https://synerhu.ru/uplcv?utm_term=the+android+update PDF link annotation
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/fixupo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/gomodufudome.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/002255a6799ac86d78568f64b6c8471d/gutetunepofogifonofu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/ruwezajiwe.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/rapugi.pdfIn PDF document text
    • http://alptw.com/images/files/23651255149.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wufela.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/basufirinilufegoxubeni.pdfIn PDF document text
    • https://adci.vn/data/upload/file/desosegamute.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/binowomefub.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/72034490482.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/37747426804.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/dovupelaxaxorululetoviw.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/felizufevadadibekujib.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c97721727---22283595208.pdfIn PDF document text
    • http://asqcert.net/files/files/pugixiwixilatovagigo.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/26045971363.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kapawitusuzoziz.pdfIn PDF document text
    • https://eetravel.net/file/molagux.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xaruwixo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/64826998679.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/26620041404.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/68502193323.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 18364 bytes
SHA-256: 2fdc7e5917cd23764e3b960ec78c875f227e27181a6956768a92fc01e7535dc6
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 10340 bytes
SHA-256: 5f54655ac4f548373051a923d6ddbe67c31adc0d6443804f109d191ac2b48440

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