Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0557c8bd4816f4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ff76448a5725af4eda16903ebfed17a SHA-1: 555e8e9b60b9f2ff31f59680c2bbf90a86dad222 SHA-256: 1a0557c8bd4816f4505c145907102c369add0deac80e71a5f8d02a129d7e1a1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://allytemp.ru/uplcv?utm_term=gta+vice+city+game+save PDF link annotation
    • https://nedimgame.com/calisma2/files/uploads/41812913642.pdfIn PDF document text
    • http://esistore.be/userfiles/file/28829680815.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/fitozepivo.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/4676539303.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bajikavikuwujimik.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/83651562383.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/kubokabo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vasabenewobukefovuret.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/furemo.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/38953409137.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/libafozariduvosobozo.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/baa3bf31cb4470b4a7d370107adcd3d2/jemot.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/10870844068.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kavabojawomeguvevorowu.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/bikuxuxumiwibuxalop.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/93360344994.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135416bb5486---vowakorawupujemurexar.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109050530406384.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zezogafudijodiwebefifawe.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021931223168673.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/88057710334.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/31015300239.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xukipokajuromiz.pdfIn PDF document text
    • http://special-pharma.com/upload/files/30594170921.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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 10420 bytes
SHA-256: 185d419b728f60bead9f9b159a40ebe06bac068c3032ea181f46e2cf5f5141db
font_01_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 16412 bytes
SHA-256: 187fe7d872a4d0400d8136fcf9d6550b0d38a934e429101cd2ab4b88cad5fbac
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1