Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8b31936f728549…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 10:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66b2f9c794fa5baacf37992df40d1cdc SHA-1: ce80c176359293e8db4b42e38c38ebf77c71ecd3 SHA-256: cc8b31936f72854944a66610102ba5014343b9c219d8c99814e126117ecae3a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/97262770464.pdf In PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/validumamopononim.pdfIn PDF document text
    • http://parfumland.sk/upl/silupavojavabifoxazok.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/nitagumikogova.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/10480865730.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210913002114.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/gisiwesajekavutuzofixik.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/39927774312.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/51813083567.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/pawerisejetol.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///81635809540.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/18392809231.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/29690964669.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134192ae23a8---8762975527.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/fibunem.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/39099784702.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/84103714319.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/59958111573.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/topelidozisejose.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/jomepajajuzuz.pdfIn PDF document text
    • http://mrybalko.ru/files/fevazamezogatosaxefajov.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/siserupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tom+and+jerry+fast+and+furry+worldfree4uPDF link annotation
    • 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_off0000b7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E0 17116 bytes
SHA-256: 5260fbc72ca3d7706a716b886449fb98d4c19176f1bef3cf7793d901d518b597
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 10892 bytes
SHA-256: 8515b234f075c7b2828555f85ec670b951afed68847a41acd9bc1cdca379e815

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