Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b446cc2993832b…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 16:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3e35de060841a77dc5fe0decd129d5f SHA-1: cfa848d8a2bfb1d51f13df9992bae153aab24908 SHA-256: e4b446cc2993832b05c1134b95977c462bf8b06bf6ae49f1426aaacb1b11d6c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=apple+music+apk+mod PDF link annotation
    • http://ahjygjg.com/upload_fck/file/2021-9-12/20210912135336317619.pdfIn PDF document text
    • https://cristalensi.com/public/File/sozil.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/20404908933.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/56338892957.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210921165419.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/31207048139.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/paluvedupibigupavuboli.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/2461889307.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/zojamibowitabu.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/25076889433.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/63848150298.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/jasodefipinikonopewu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210905_075957.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4830666a8---vasidatavuranirogus.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/fasepukiz.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/90884505118.pdfIn PDF document text
    • http://runhouchem.com/upload/files/mabuniwukupexod.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d61fa544c9---vijasasiwofogogubeb.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/82654949105.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/90985250652.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/97158116749.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/90977891471.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_off0000ace2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 14524 bytes
SHA-256: c95c27fda9111429dc5d5bf5ebc722cfc283c6aed9a6a2379d48a5ee1eb398b4
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10544 bytes
SHA-256: d2fa4052d779bb6a5188628c0a7d03b9c2f2d50062c5a8b9d9eba26e6647209e

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