Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb1a30391714f98…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95a51e89ec4dbc61fd2bf9a02515dd9e SHA-1: 449d03725d61b64622e3ce0b6acddd2e77839115 SHA-256: fcb1a30391714f988ecfef8d8e36c2f928892cedc0ffe432931e353ca8eabb83
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 a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=bluetooth+finder+app+free
    • http://gaongonmaiphuong.vn/webroot/img/files/25254849889.pdf
    • http://kaymccarthy.com/immagini/file/43727730886.pdf
    • http://brava-ekb.ru/userfiles/file/vunewilakeviniluxabu.pdf
    • http://alrabbancapital.com/file/files/gofoburupovevuz.pdf
    • https://perfecthospitals.com/FCKeditor/file/85910336052.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b251fda6---23771243589.pdf
    • https://0a3exp.com/upfiles/editor/files/92689001808.pdf
    • http://blessingsngo.in/userfiles/files/lawoxatoguwarolusibidarat.pdf
    • http://geometracosentino.com/userfiles/files/81514440942.pdf
    • http://langeline.com/ckeditor/upload/files/77842479560.pdf
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdf
    • https://ip-pharma.net/data/files/vazajakararozogatewobina.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/6015439839.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/56723581287.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/45585160513.pdf
    • http://a-mega.ua/images/uploads/file/tunorirujis.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdf
    • https://rmduncanrealty.com/userfiles/files/tavobafukod.pdf
    • http://startent.ru/SITE/files/editor/file/xagesazetusasunovipira.pdf
    • http://captainkillmite.com/uploads/files/202109130310495475.pdf
    • http://irodaszer.lukinserv.hu/file/10883134133.pdf
    • http://m3hotels.com/userfiles/file/7363352277.pdf
    • http://client.diffuse.info/files/zusipi.pdf
    • http://hsound.ro/images/custom/file/lokefasogomafonaboxaxab.pdf
    • http://xnucleus.com/members/member_images/files/kebowe.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_off0000cdf8.bin
ffea278226136d13ee85efb1b67fd6b0c0a699cb608a61283c8a40bd38cad8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 17104 bytes
font_01_sfnt_off0000fa6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
font_02_sfnt_off00011285.bin
596809fb215e7371bc9f7a15aabaa00239dde9743395c0559596c66d32ba42dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 10580 bytes

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