Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cad464f458ed2b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 19:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 043ff14fc610dead93ff9189163cd018 SHA-1: e3e0db02dc97e4d6219ef254def0981a11f7cb27 SHA-256: e4cad464f458ed2b9174699cc18ee20478df642aa23b1ea90a41f003ef60882e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=active+directory+troubleshooting+interview+questions+and+answers PDF link annotation
    • https://yukkumpulgroup1.com/contents/files/79247326030.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/finatenutosajosekekataju.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/zidekelab.pdfIn PDF document text
    • https://majubesar.org/contents/files/karozu.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/13291708548.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39573e1e7---33313599518.pdfIn PDF document text
    • http://perksys.com/userfiles/file/salifubeteroruxiguwez.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/jozexigapakesekalizugevop.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/gojapakazufajilesarojofi.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/16521185934.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/4956345682.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52357844576.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/vivimug.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/nixuxetekunipade.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/vowomikuxobi.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109020048108130.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef94cbf6a0---gojifagataziv.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62656849366.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/26620041404.pdfIn PDF document text
    • http://mebco.ru/images/file/fazewetaxeja.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/wokitesirekine.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/32581210382.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/xoritubafuf.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/bapodesafivu.pdfIn PDF document text
    • 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 17452 bytes
SHA-256: b40526ec076223e360d7dd0df798e1e204f873ecd2f520caa08751e870654443
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 11284 bytes
SHA-256: f8a3065a2d0d28fa4644da8bea17a45af17c20114c51de2538cf208dcb670d86
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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