Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aa7d52a308cabf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 610db615fd62732773fba35510466563 SHA-1: fcb07fdf95b57b8c21424ea216ac707651e5d257 SHA-256: 02aa7d52a308cabf974a0cb4a6b2a93058c1687f699a78a3d95f821c8c9e8c26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=kindle+fire+os PDF link annotation
    • https://efckrakow.pl/userfiles/file/45797795969.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/josenamitukisom.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/99919649926.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/23594613804.pdfIn PDF document text
    • http://sun-tes.ru/files/file/75097456396.pdfIn PDF document text
    • https://servicepapik.ro/files/89490735915.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/misiwegepijazepax.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/xufazafe.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/19339406369.pdfIn PDF document text
    • http://gabortech.com/admin/file/majorobosowizonil.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/61618120603.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/zaginunovitubaxepama.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/ruxedawunowogetewuwe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d336ee0ddd---55085714540.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/72912863052.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/44673624018.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614590ee98efd---mavogovugilaj.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosik.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/13084408997.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/zuradujudilaz.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/gavimopotifumuset.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/19549850551.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090613342073499.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/11131515313.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_off0000b623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 10080 bytes
SHA-256: 49816e7725daf4271251c37230133ddc99c9c9d35cb9db2619655b76775ae16f
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 19088 bytes
SHA-256: 88c3fe070a216bfa342e5a5aaa319ac48595299bc719b9dfe3b0fd7c398ef31e
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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