Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a59c836cf445955…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 14:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40a3c85a6195bc88cbca4484a18ae222 SHA-1: 883a98a495fabd4d2c49e43a181f247c79232dd4 SHA-256: 9a59c836cf445955073fc7e6428cc95a0ad8e872f85feba53bd53b897da27185
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded content are consistent with attempts to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=goodnotes+5+free+android PDF link annotation
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/24725508796.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/4551200903.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/rumavakemumidepadomiremo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/rolenog.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/46659839685.pdfIn PDF document text
    • http://a899.net/userfiles/file/79502510608.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/voxolobaluvoxi.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/29785970127.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210914042528.pdfIn PDF document text
    • http://citranco.com/users/files/70591755217.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75b6a5c2d---ramixuridoxifi.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/sitife.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/dowukepovukasebofivegipe.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/felopozogaxononalolakawe.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/28762261708.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/64697399997.pdfIn PDF document text
    • http://feg.vn/uploads/files/jaxorisigupiba.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161360292be059---17845621566.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61361980304.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_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10476 bytes
SHA-256: 039cdaa237b011f517fa377eef68de9fcc06463b5de0e30bd45b02aeaf2e1438
font_02_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 17892 bytes
SHA-256: 586db1737fed59fc5795acfff9e4f40623977603518a1cde57a96d920f80669a

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