Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0d8373a8ed7005…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 18:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0759abcd99e63b07b2614ec0bd4ca50 SHA-1: 561b5c2fe7c54a3488f5ddbb3ca42a9e5f9102b8 SHA-256: 8e0d8373a8ed70053af9bcfe388d298c8e6d8c2d7a3ea9a553b88ba5dea76c00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=the+monster+book+of+manga+pdf PDF link annotation
    • https://nvsrolko.org/ckfinder/userfiles/files/88274976668.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/melotorirugiwu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0e3145c1092c1a401f43ea7893853c07/vokisinilidaxazokod.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/85394855053.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109030334172244.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zakudupuk.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sixupew.pdfIn PDF document text
    • https://yifff.se/userfiles/file/39407343794.pdfIn PDF document text
    • https://e-room.co/userfiles/file/muvituviluwubasot.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/41277536460.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85264043989.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/jazomitesupabojo.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/resovileta.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/8663155994.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/78981670104.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/jelanikukogu.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rinoloxegufavozubaraxu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7eb70a3c0---82076201678.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/79216532166.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/jajegotigejova.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/totugisajuzivanimof.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/dixadujetebevipox.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/luwelalimu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/latebepozevenujem.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/66137416947.pdfIn PDF document text
    • http://ciskmv.com/css/file/zazekume.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_off0000c141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 17160 bytes
SHA-256: 8945d551b5034422519087e201dcd5ac9e4c8c4e52f95e6f865a5d3ab4d976f9
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 11004 bytes
SHA-256: 6c179e95c93510cff24370adea7316a3fac0f3779653f496c1b2e882952f7609