Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff03cc85170e6d8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 00:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97dceb5dd417188b6ed8665b7315a698 SHA-1: b46733fa62aa99d81ac4903ce4d176d93eb6d47e SHA-256: 1ff03cc85170e6d8de217a65e0793918af58d9222635420b1e7e635fd7a8bdc0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with a critical ClamAV detection indicating it is a phishing trojan. The presence of a visual download button and the ML classifier's high confidence score further support a malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=best+two+player+games+ipad
    • https://swalaya.in/userfiles/file/40380842524.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/29873489153.pdf
    • http://ghalemdi.com/userfiles/file/didixuwigeb.pdf
    • http://dautuck.com/uploads/userfiles/file/gafajapizugifekolaroxuwom.pdf
    • https://ideylia.fr/uploads/file/veluwanowadezip.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a291214aa---xejijebakuxubibag.pdf
    • http://studioturina.com/userfiles/files/4440455096.pdf
    • https://maryamghiasi.com/images/upload/files/zixiketenufug.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/sejamotesisixoniviwuliko.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/dadadunufimaruloseso.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906160152875375.pdf
    • https://ekoelprom.pl/public/images/editor/file/14499707867.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210903_941B2AB28DD44E1F.pdf
    • http://verkaufs-akademie.com/userfiles/file/tidifadomipapin.pdf
    • https://tepatsasaran.com/contents/files/kafojiwepaguwipabupanorew.pdf
    • http://yao-cheng.com/uploadfiles/20210913073620.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/31537098090.pdf
    • http://dtpokebar.com/uploads/files/tenesapuwurut.pdf
    • http://desiaussies.com/ckeditor/uploads/files/sevapiwigim.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/bosokejinoxevubuwitil.pdf
    • http://sun-eko.eu/files/file/lufumopuseforapikaru.pdf
    • 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_off0000ddf6.bin
5c9c4983830969ab6b2688cfdad209f9c64da3f603597c40c392d1a70846807c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 18708 bytes
font_01_sfnt_off00010e8f.bin
904be5a62bbf7c535f2313f5167b28aad7230679ae1863b3de0df43bd1edd0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10884 bytes
font_02_sfnt_off000127b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes

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