Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa24760ae3c240d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-24 07:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db267784e1fe7ec8c49ffaee230e87d0 SHA-1: 7a3d1a482a61128ed8a7839c2d7c91fedcc80b1c SHA-256: caa24760ae3c240da0ae7958f5f4c97f9ccec96bae42257758e323fea89d854e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to distribute malicious links across many domains. The `utm_term` parameter in one of the benign URLs suggests a potential lure related to game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://afma.pt/site/upload/file/femuwagifavizoj.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fexefugo.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lededetujinulusujugo.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/39551662975.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/jaginusulafawavojumuvav.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210910_000418.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4350477f7---29387669785.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/fomeja.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sulenuxodur.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/45172918640.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/87d4c88034841f77f43de6a8e2947904/fijotujokuzep.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/fowamojoguwifen.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/54379741577.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210901160436198.pdfIn PDF document text
    • https://taperagi.com/contents/files/mulikuxumivoguluwo.pdfIn PDF document text
    • http://xtra360.net/campannas/file/39893501910.pdfIn PDF document text
    • http://recviem.ru/img/upload/7574080366.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/11310551649.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/28567004807.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fuxobujebelikexa.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/guzoxaporinozemara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+bloody+platinum+cheatsPDF link annotation
    • 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_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 18104 bytes
SHA-256: bfa51252ee2006c02750bf14ccd93e25be52c3005e5dc43ee70a820f2ed30937
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 11128 bytes
SHA-256: 0163608e2e24954d294b80564c5d039e7952c68f359d7a1c25a389f9e363a3bf
font_02_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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