Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b9122cf90d3311…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd8f608710ef0e4f3d713f77270b0f4d SHA-1: cfc4652b1bc39084f7512595cc0f4294f0b01549 SHA-256: 15b9122cf90d331114c3b6a0e00c466d175d229ad4bf792e5c96ae26680c9e11
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=wrong+turn+movie+full+movie PDF link annotation
    • https://evpersoneli.net/ev-personeli/file/72154417218.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xuniratusobimugofugevum.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/gezabebuvebimipujepa.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/kexogilanozupimewej.pdfIn PDF document text
    • https://edarky.net/data/file/petapabukeragaralibizafi.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/ruzemidatomuxupolapi.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/84270523584.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/8877277378.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/40322804096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd6f57d20---40562485336.pdfIn PDF document text
    • http://oris-am.com/editor_up/72901751384.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/roseganaxotebudud.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/37264911997.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/26367343826.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/bidegukibad.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/41718231546.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/34379337355.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/mafimi.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vajotowonizemug.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pofidazejitu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/26121966450.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/mamoxijazupewofos.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_off0000bdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 17212 bytes
SHA-256: 16c35e9ff317618f130a2dac2ccb69fdec633d2d84e661be5b7f7b834125bb84
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10384 bytes
SHA-256: 1b48e07e085ccaa3f8ceca004ff0e38e2f1941a8dfdd8c58cb90d3ac2b1fcc40

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