Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b127676cc32b33b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 02:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 821e09a75a83fb6504e872e223fe6eca SHA-1: cda860fe079fc5f37b6ac2f48fb153036e0a0ccc SHA-256: 4b127676cc32b33b1efeb605bb7262cea70936d25f0a40cfadf2d85165b1a167
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 pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose beyond hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=5th+edition+player%27s+handbook+pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/64972411629.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tirefezezonimilefepopawi.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/29469009938.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/zeridofuxarilipokik.pdf
    • https://ahreco.com/uploads/news_file/sebebatadovozugirure.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18d3bce65e9831c043417c4ab2827659/87537905468.pdf
    • http://pskov.agisinfo.ru/uploads/content/files/22996845855.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fcbc9e5171dd7cb809ed52c50323f27f/97577158329.pdf
    • http://robwalker.net/fckupload/file/99648438100.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/32598558951.pdf
    • http://pantipplaza.com/userfiles/file/43775743300.pdf
    • http://aeon-dev.com/uploads/files/202109141009418621.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/duxinadesuvi.pdf
    • http://decamiones.com/userfiles/file/98837108624.pdf
    • http://kesifveotesi.com/files/fawimojibane.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/63096752117.pdf
    • http://hb1004.com/userData/board/file/kawinozoje.pdf
    • http://uniradioweb.info/userfiles/files/ruvemabupexoritapute.pdf
    • https://soechi.net/userfiles/file/166586464.pdf
    • https://rajatotogroup2.com/contents/files/nirixeximulasofezu.pdf
    • http://obkladacstvikolar.com/content/41657394557.pdf
    • https://argekaucuk.com/nbg/upload/files/kutawunivinogefew.pdf
    • http://ecohort.com/userfiles/files/5552165256.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f8.bin
b19a96c302c8138b364fd432d02c77bc1f215f79b283f2387993e1439e2d627f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 11012 bytes
font_01_sfnt_off0000ea55.bin
dbd762e3f60dac26d2773e5d12ad18d6857c6d2941b2b3c8bba559023de78901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 17280 bytes
font_02_sfnt_off00011772.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16792 bytes

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