Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc9d973b69777ec…

MALICIOUS

PDF

72.7 KB Created: 2021-10-04 00:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ea1484a64b61bed3b7cdaf3f7ed5359 SHA-1: 4fa0801672046bcf3549abd76f39e4c778d8f26c SHA-256: 9bc9d973b69777ecb4685a79a85531bcf3e767b58103d975c070d9cd762b97f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=section+179+deduction+vehicle PDF link annotation
    • http://grupposcorcia.it/userfiles/files/55665501141.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bixitoguji.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/gafoxawojuv.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/ganude.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbbec803b9---27505745722.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/mututizomujuzatekuvux.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/doluxexezefusajesapora.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/muvad.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/vilufogajiboke.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbol8k4b9vtp5gkvca5k3848a5/48535237034.pdfIn PDF document text
    • http://baove24h.org/upload/files/78283132076.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/fidulebasawuwil.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/golunotumevejetigun.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/69945843123.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/tugetiwujiwekezixesav.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/ferafenuri.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/tisetifakisud.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/venanekamumetemedod.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/93282123514.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/99903608306.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/47823661918.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092721253677.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pijagudegoxupoxezasixa.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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 18472 bytes
SHA-256: acc50373e98f70d1154eccdaba858bea39de54ee719b14edb62843826ec05588
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10548 bytes
SHA-256: 5884b25fae81ee2374f9401646228ffd35ab3329d6f4fa245f27ce6abdb72087

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