Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bc84b993bb7f2d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 14:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99cf7f0b8b7e85a69b20ff4edd89a778 SHA-1: 72d62cd79edb98d0b9eac92f428d5984daa748b0 SHA-256: 60bc84b993bb7f2d175f8338bd0804829c04091446d1bc8a9d24ab86851da1e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=flame+man+mod+apk+unlimited+money PDF link annotation
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/femuxanuzikolovotonis.pdfIn PDF document text
    • http://katela.net/userData/board/file/beboruvinijogisolabagu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/83525488700.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/6419375972.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • http://hexindechem.com/upload/files/pizogedab.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/vanuve.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/sivaboresonuzivin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359a2b50461---73566437730.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/20502183234.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijopokekojo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/sofunekotojesore.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/nuwopagul.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/27557833465.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kesutunexifebunoliwuteko.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/jebakogagololoxogafi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335891b766d---jopoxetuginarufuvikepu.pdfIn PDF document text
    • http://labotinnghia.com/img/files/16808991430.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/89096938703.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/xutirovefotosiv.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/35830665849.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/58024053871.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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 17916 bytes
SHA-256: fe387d9a47c7e8ed2251652d0ef91ea2ae7ddba25b7fd34048d469dcb251525b
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10568 bytes
SHA-256: 0a2ee485e5141a64104fbbec9fb6b75787c2245bd1d570b18c52f30de6f4b7d8
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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