Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef54b77b241e264…

MALICIOUS

PDF

89.6 KB Created: 2021-09-16 22:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8afca918fc2c027f2b965ab087591eb5 SHA-1: d32fb7cd5136005588610b695d7c073d05abedc8 SHA-256: 9ef54b77b241e26442bfbdc35fe0b1cf5e9ace704331fbdb26f336e9f7a58d62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4d406447218a90d69b8b9a408eb867ab/54573667846.pdf In PDF document text
    • http://compow.net/ckfinder/userfiles/files/34289042542.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49203253934.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d36017221ab64244294c41ded956d05f/34174023688.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/75970304833.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizigavomidasuduzosamuzu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/80013210041.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/70142872146.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/44590290250.pdfIn PDF document text
    • http://origo.ws/userfiles/file/lajivumofuzikinurubitif.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lafuvakidewozetujepivel.pdfIn PDF document text
    • https://digireg.dk/upload/11132901247.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/piginozefegigogukevem.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/54902455100.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/25768912963.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/fezupoxinuxotezajanipafo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tenewip.pdfIn PDF document text
    • http://generoussecurity.com/uploads/fumilo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/jegulofuzafujel.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/46934957744.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jozudarufufodali.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/suxubopixowakaxis.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/sedabusudef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=transfer+android+phone+data+to+new+phonePDF 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 18476 bytes
SHA-256: d7aa14bee90c9c15b41bb9d486ea1ec3013cddee3fd6b2e8b6278c60b4d54899
font_01_sfnt_off000128af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 10600 bytes
SHA-256: 0a01ef8053c0f8bb98b651d60631e714b2da424701c2d1320aea4149b7aa47a7
font_02_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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