Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fe2aa859039e96…

MALICIOUS

PDF

67.3 KB Created: 2021-09-28 00:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 304e29fc2fb5133ebdca54d954070178 SHA-1: 483a53663af5cf43df7ad33a2a50ee968e17564c SHA-256: 35fe2aa859039e96428978818dfe345b571e083133b616b41463ebe32ba62e97
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts. The embedded URLs, such as http://devitohomesorlando.com/userfiles/files/38243217807.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://devitohomesorlando.com/userfiles/files/38243217807.pdf
    • http://lyzph.com/userfiles/file/Fl202109242016594394.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b576d191e---bigijajixagaragejofil.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/95499330543.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/nufetaxegiraponorijexaza.pdf
    • https://sonerofset.com/userfiles/file/sasugufufebaxupu.pdf
    • http://novehorizonty.sk/userfiles/file/41414124080.pdf
    • http://hongdanhaudio.com/luutru/files/vimuropa.pdf
    • https://tckontrola.hr/files/sezutolurowozateju.pdf
    • http://bolt-go77.com/fckeditor/userfiles/file/xodape.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/rebujase.pdf
    • https://eminentland.com/admin/userfiles/files/tefef.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/sudesonifinamimi.pdf
    • https://lescourailleurs.com/upload/editor/file/kavusipagulunaxa.pdf
    • https://rajakeempat.com/contents/files/82370235164.pdf
    • https://quizai.com/uploads/files/87338244815.pdf
    • http://mebelhotel.ru/images/news/file/remax.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326fc3a76b1---16114191833.pdf
    • http://gidaero.com/upload/fckeditor/file/bubilutetuxajekusewesaz.pdf
    • http://leebyunghun.kr/new/upload/board/files/munebez.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/vowubaliwatagavidukelamuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=z+fold+2+android+11+update
    • 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_off0000aa91.bin
302e3d31dd57aac4dbb6fc311acb5aabb9305da7ebe192d1850b55c5e9f03acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA91 14680 bytes
font_01_sfnt_off0000cf64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 16792 bytes
font_02_sfnt_off0000e77b.bin
9194b69a5bd4851d2a6316277e48010fa52afe222f1a839b1fdfd7380fcb7fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10556 bytes

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