Malicious PDF — malware analysis report

Static analysis result for SHA-256 86564f6f6d4dc716…

MALICIOUS

PDF

73.2 KB Created: 2021-10-04 22:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ea590d089adbdf453096e4ee12e890f SHA-1: 662f145ae6a09a4ef615fa7d4246d9a863a8443c SHA-256: 86564f6f6d4dc716c8899d530cb4795dd9b9ce42ce801e297ec25b77538b5a43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting the PDF's purpose is to host a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=all+about+charles+dickens PDF link annotation
    • http://sooam.com/files/fckeditor/file/258283689615374d01ce0f.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109280957043506.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fujobagufeka.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/lekibavunageveso.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/girive.pdfIn PDF document text
    • https://ccenter.ro/userfiles/files/gutinufotefatadeserisu.pdfIn PDF document text
    • http://gojjang.com/uploads/files/38413890118.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-10-4/20211004150446142097.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/gobanonima.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/13936861490.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/wubatijiwu.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/koxonoboruzikebupozopiku.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/mawegewufabugabikoxopud.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/77923431897.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/93737589553.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/fuzugexo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/63318988139.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/36294792260.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/70685545349.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5660ceffe---zexufaxawilutatatak.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/pivul.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ad31676ae8---34934891531.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/99336543576.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_off0000b92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92B 10780 bytes
SHA-256: 098f7b1481e07da8f8719a2d7be184f6a2e69ab2b51888107949a7a267db28ee
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 17276 bytes
SHA-256: 4a43c04d424cb09a22cc41fb360f6fd30c09627f48cb657f43c4402391c65429
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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