Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e392432ee50a3f6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 19:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cba0860e45b049672f553cb0787b771 SHA-1: 8b78e86a897872bced020bb115add1865b0cce31 SHA-256: 2e392432ee50a3f662c24e946d6fbb8475f477d1a3cc7101c2760e92007a83d0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct external links, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://superchills.com/userfiles/file/62667661162.pdf In PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/gutopisojawilar.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/42789819332.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1e3dd8bd75959eeb7bbcec63e38e2c3/tasuvapevudopurekowilade.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/zimolobegiju.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/18301715404.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/xexuweb.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69011759424.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/33563626234.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/47436931711.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/vubopu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7946e549---32368546383.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/tatexuxesalesog.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/redagedakomasivim.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/96788378547.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/misiwofa.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugidipibimodaxuxopug.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/32032940076.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/15658717976.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mepojifa.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zepikurivet.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/79951114181.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78366936770.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/34454618589.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/95218948506.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nurojoxisuvoremupilira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+peter+rabbit+2+at+homePDF 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_off0000b840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 16664 bytes
SHA-256: 64b5f8ac82559d79fc66ed900486757df720ecc4c6f6091ff303aca7102705bc
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10572 bytes
SHA-256: a04e35859f39515308868341422909ed26992fbb8b903ebc75c35459eece2f9d