Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df6744ad835176e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 10:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 334e7445ca118f2999f46d6232311e77 SHA-1: 8cf6f58ef9da080b8212b7faba5b9d5561fb1874 SHA-256: 9df6744ad835176e992dd53c65b9f010b58719c1b77f7cf4883f5e304a68c3d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous external URLs, suggesting it's designed to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=stranger+things+original+script PDF link annotation
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/11766507290.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/74866700339.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b551d38f88---65278673475.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/95022253389.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/goxogoxofi.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/80184808499.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/diwafarafudilav.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/438073041.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/kilozoparonimabodak.pdfIn PDF document text
    • https://claudiodituri.it/uploads/80504995787.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/bukipaba.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/ruxerapiliponoruvu.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/nazebedofufajetokigu.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/94940352053.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/degigog.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/17559368939.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/suzomewigamowuw.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/62946797353.pdfIn PDF document text
    • http://knauto.com/upload/file///97873062233.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/peradizolaz.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/44191218484.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16430903085.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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 17580 bytes
SHA-256: 9c81a4872e45f80e7d2416e0b68fed04a6d1c5829132ef5502de634ab5e43d4f
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10728 bytes
SHA-256: 78b4520a249bab95b9084093d0d78535a52cd7d64803851a540f322cd01add6e

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