Malicious PDF — malware analysis report

Static analysis result for SHA-256 86782a3a0ef1d5ff…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 10:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cff217556d45069e1ce7143758a1aa23 SHA-1: 1a740cb97d1c64489ce906254f15409683cff089 SHA-256: 86782a3a0ef1d5ffb150ff660b37a09f51691370e476f755b08fc4c60768a069
134 Risk Score

Malware Insights

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

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to execute malicious actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the PDF_URI heuristic, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://forglory.cz/ckfinder/userfiles/files/kiderenoxik.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/wavunapivuz.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/3853182772.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lebizefezowi.pdfIn PDF document text
    • https://toocapen.com/files/vekuraded.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/87038802730.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_FB0278FA3A83F09A.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/zovusirise.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vulatozum.pdfIn PDF document text
    • http://spbi.cz/res/file/mulumolusigotoxugiwe.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/dutizunoraku.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/pajavusarutokafozuta.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/15943561797.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/posakepufoxigulanutev.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210909080707.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141983b2eb36---roporubowiguvimibivozer.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61458ebf1dd76.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/74211259201.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/nejomofuniz.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/firuniwelusema.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8cc1f9ca---69074180607.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/10255213614.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6999239248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+mauritanian+streaming+vfPDF 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 19584 bytes
SHA-256: 691dd5cc3a9b2dde8966a9b1f7d6b9a590cec5d0a00c60b591a264f8a5ae86be
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10624 bytes
SHA-256: 3b7df1ea1da7444bc1eb4515fcd02f4aa6400aaed49f350f4e416c9bf1aa4f4c
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1