Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f8b59d1230ad9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 08:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83ef8221fdeb97fe1810e786b926904 SHA-1: b1f970fbc18107979327f7af672b053b875f12fe SHA-256: 5a7f8b59d1230ad9211aa2963bb1000a02eef0242edb8369fc6797d1622170d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to host or redirect to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://parlagame.com/calisma2/files/uploads/sogaguvux.pdf
    • http://factory-01.com/js/upload/files/72459984564.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/99051762552.pdf
    • https://armenia4d.com/contents/files/87599863860.pdf
    • https://peusch.lu/userfiles/files/43732710404.pdf
    • http://modern-pro.ru/files/file/49732992171.pdf
    • https://onthespothousing.com/userfiles/file/91594382897.pdf
    • https://interference.ajoda.eu/userfiles/files/seguwefoboge.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d2a5461a---zupogosuzuloximino.pdf
    • http://benly-carson.com/product/files/wusovowunimoxanogetufegi.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/16729792848.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210910_E297AC929CEACC90.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/49412342959.pdf
    • http://iphysiology.ru/upload/lexigilusopuro.pdf
    • https://agronlogistics.com/userfiles/files/82359246042.pdf
    • http://jedwines.com/cmsCart/upload/file/lujugosinusekikomazoxa.pdf
    • http://come2menorca.com/images/file/watoderukemegojabeno.pdf
    • https://xn--interpeas-r6a.es/upload/files/nowivunafiwesunibopofex.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xinukovixipe.pdf
    • http://bacvietexpress.com/upload/userfiles/files/lajowupetejovitejukoru.pdf
    • http://hoinhikhoavn.com/img/files/92581262246.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904061513787264.pdf
    • https://viktorina.ledoritulys.lt/files/nasilekixugubun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=haircuts+to+slim+face
    • 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_off0000db79.bin
cc872a0fd16259e49c9f8bd8eadd9dc2f530f677582d8210029534a3d266ebd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10484 bytes
font_01_sfnt_off0000f353.bin
5c919e336e42e0e3a85a64c64e4223a64015d267b9237f5c993f470ee7fad69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 18080 bytes
font_02_sfnt_off0001215e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16792 bytes

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