Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afea5380cfdccea…

MALICIOUS

PDF

99.4 KB Created: 2021-10-06 03:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c760f6c03f665b98785d1bfc9b8c1d59 SHA-1: 0a39d604b1b54e12bf79040c4a52526f3253c292 SHA-256: 1afea5380cfdccea5a12a8838a1d71d3e952952745fae596243ab648055f49be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=remove+permanent+marker+from+vinyl PDF link annotation
    • http://elskenecologie.nl/files/64474021951.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/11061482431.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zogemikivugokowaxavunotaf.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/30156675312.pdfIn PDF document text
    • https://hoalavender.net/upload/files/supumolimokenenutikikid.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/52441766526.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/gubowoguxuzipejobokeseren.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/xawop.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/91111566038.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109030309584114.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/16791020752.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/89623111557.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/19306961102.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20211001_78429A18CBCEB232.pdfIn PDF document text
    • http://pb-book.com/user_file/file/dabixonajoli.pdfIn PDF document text
    • https://mcsfood.com/images/file/fofivujuxozik.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309eb87b2dc---susese.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/fifitur.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rududuj.pdfIn PDF document text
    • http://feminella.ro/upload/fck/79838726153.pdfIn PDF document text
    • https://clubon.top/uploads/files/53043960106.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/43822789850.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_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10668 bytes
SHA-256: da07db50403eca6d434e34a287639076a85f0369b039cbb610341e3419e86298
font_01_sfnt_off0001355c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 19528 bytes
SHA-256: 20957ec4d9230ff8ee1ee4bb631f66455cde3005b4e8bc2d62c9aea6c95037f4

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