Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0d62860dfd219e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 09:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a1e8fe239264b3def79a7d0601187d0 SHA-1: 4b1eb4d5f6fa3d9bddd886307798c0cdde727445 SHA-256: 3a0d62860dfd219e3a936d3731d25f86f0d85cf02dde074280d2d3ca76eb64b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=all+n64+roms+pack PDF link annotation
    • http://kamakuralosgatos.com/uploads/files/gagitemoguzoridomifafax.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/80289554385.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d000409777a5cf230119e31b26c681e6/9804515884.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/75197625223.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090612471443.pdfIn PDF document text
    • http://hak-al.com/resimler/files/fepevinoja.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lekaxam.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/98996909856.pdfIn PDF document text
    • http://akademibt.com/resimler/files/dusixajis.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/32717007397.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/xevodu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2acebb202---15761024180.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/49124114044.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/24638991028.pdfIn PDF document text
    • http://snft.ro/media/file/kawilirubol.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/filapozizozo.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210907084513.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/44739881320.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/tolugonugugigabusu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nozasuzodajituxelofavu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80557736855.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 18544 bytes
SHA-256: 392c8858eadfe99251be49d944d8ffafb7903b28c1b3e49e744436bd42150017
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10532 bytes
SHA-256: efa7cc9dcf12bb0e8360f3573704ed0c7cf8f2653a6d2afb83ebec472e9b3bc3
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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