Malicious PDF — malware analysis report

Static analysis result for SHA-256 46daf99060f15ffb…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 15:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7ba6d475a19b3c162006104c4f3dbe7 SHA-1: 1d8f7b44c0fe94a227eed90a1ae3981def6dd781 SHA-256: 46daf99060f15ffbe0491488a8a166ab8d5a472a7430914e85f2c8b4441a6d23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it's likely used for phishing or to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=the+art+of+electronics+third+edition+pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/21997231289.pdf
    • http://abpjse.news-read.com/upload/files/14986530286.pdf
    • http://kukdae.com/files/fckeditor/file/binigukanusige.pdf
    • http://dialogueinpraxis.net/files/docs/30642567026.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdf
    • https://peperita.it/writable/public/userfiles/file/96278931857.pdf
    • http://maezawa-jidousha.com/js/upload/files/vupawonixilojoxobol.pdf
    • http://cissi.it/userfiles/files/bawafeki.pdf
    • http://wamer.org/userfiles/file/44638240978.pdf
    • http://bucatariizidite.ro/printuri-fi/files/14089594074.pdf
    • http://omonetach.pl/foto/ilustracje/file/satubifud.pdf
    • http://jl-vacuum.com/upload/files/mufejanugapar.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf059bcba5---jogopoba.pdf
    • https://soudurelauziere.ca/upload/editor/file/69036736629.pdf
    • http://momsystem.ru/public/file/zukofim.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/lirupunigaferujeba.pdf
    • https://coffotea.com/uploads/files/202109081417266303.pdf
    • https://baigiangtoanhoc.com/upload/files/17382790841.pdf
    • https://ipekyolumedya.com/resim_galeri/file/lagedetukugelak.pdf
    • http://vattuxaydunghl.com/userfiles/file/98149143747.pdf
    • http://drivescuolaguida.it/userfiles/files/wudobaw.pdf
    • http://chrislahoda.ca/userfiles/file/sejijevuz.pdf
    • https://benmoonpharma.com/userfiles/file/94466197407.pdf
    • http://copy-office.it/userfiles/file/pizawefugenirexivixesi.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_off0000be48.bin
e6dc155e3bf6bd9b7c72515b070435b00cb0b0ae584a8081ba1205a7b99ba6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 10680 bytes
font_01_sfnt_off0000d6b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
font_02_sfnt_off0000eec7.bin
2c31c93fe7b72893e90ca65389d1a4645d862b5eb0bdf80a311d0c2abcd2bd8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16920 bytes

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