Malicious PDF — malware analysis report

Static analysis result for SHA-256 095b247417f74c66…

MALICIOUS

PDF

98.4 KB Created: 2021-09-16 09:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0d4668058c63442bb8243eea9fc3d3c2 SHA-1: cad1cab53aca5317a3a5aa32d90869cd885a0219 SHA-256: 095b247417f74c667fbf4fce32c1dce7ac6dcfea5a2ce2e570edb7b0f4b2e94b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=psx+rom+collection PDF link annotation
    • http://toroisg.com/public/images/files/wikimatito.pdfIn PDF document text
    • http://zeci.nl/im/image/jasitenawonerifubane.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/semijuwedeferajupuf.pdfIn PDF document text
    • http://4bx.pl/public/file/vapovud.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/92260299891.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xewubuzimikoxiwopokivij.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tarufatizulofivogevasajik.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bexofanaparogefa.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/90766039707.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/1444066722.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/57902969490.pdfIn PDF document text
    • https://togeltop.net/contents/files/89781829842.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/23634073875.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/02752e343f1725fa3b71136c34a73e34/3939730418.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/dibere.pdfIn PDF document text
    • https://suruburi.net/mm/file/vibitin.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/22681700130.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/nulumokadovexizikor.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/12010018187.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vagaletej.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/6680885608.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/mafenanurijo.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/89895457236.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_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 10332 bytes
SHA-256: 8cb38235809064387a7ed2d8cc607692da530293343ee6a5bb570e5056c87b84
font_01_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 17424 bytes
SHA-256: 56df662ecf6b3feec4b1c0e01977cdfacbf8a5f56449320b62b942bfddc9d78d
font_02_sfnt_off00016403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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