Malicious PDF — malware analysis report

Static analysis result for SHA-256 482ba19d4a37f173…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 11:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59e88a9f1aea20ed5c5a54a12420a993 SHA-1: c13a014f0234a44cdca5c5e7d97afa9456ca466e SHA-256: 482ba19d4a37f1736c00e97fef125b571ed6790a8e03a08726e7484363b14432
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to direct users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wastran.ru/uplcv?utm_term=what+is+bluetooth+midi+service+android
    • http://citra.cl/userfiles/file/67215656010.pdf
    • http://gruppocreta.com/userfiles/files/28357672751.pdf
    • http://airconbank.com/upload/fckeditor/file/91458502930.pdf
    • http://webspace.mysdam.net/images/newsletter/files/89509288452.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutopasafazirijologikelas.pdf
    • https://batikatravels.com/userfiles/file/15475126440.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28648899577.pdf
    • https://wonwon.taipei/photo/file/40311493215.pdf
    • http://exms.fr/sites/default/files/file/83060493687.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/73559070495.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/24333955090.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39175590542.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/14195327888.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e915a649c1---36666593752.pdf
    • http://tuzvedo.hu/elemek/file/83996523795.pdf
    • https://tutorsbureau.net/userfiles/file/ratit.pdf
    • https://panoramabyty.cz/content/tekomimu.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79201114174.pdf
    • http://wolfroccatiassociati.it/userfiles/files/mavesisozekamajogopive.pdf
    • https://kentacademymiango.com/userfiles/file/davupapufozemelunep.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/94997f65bb0be005a1337ef94b5e2aab/93791248311.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_off0000e9a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16792 bytes
font_01_sfnt_off000101bc.bin
ceff8a2932f437e9274c71592d3d6bc7b13583611cf5876771d9f3a23981d831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10932 bytes
font_02_sfnt_off00011ae2.bin
93a5ae7a271ba24d4db2ba3012bb2c38a42590e5b9127b7ebc19df6e316629e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 17896 bytes

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