Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dfe726ed2bbc60…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 18:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ceb6f3d13e91fe094511eb5f55847809 SHA-1: f5225ec42d0e4caa76de42d1104bf239994b1c87 SHA-256: 45dfe726ed2bbc60d6ceaa9c342672b6e6f0477f6746daea0c7f6d7ab0aeb736
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to lead the user to download a secondary payload. The presence of a 'download button' heuristic further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://webbuilders.com/files/file/muzowokatakipanagodi.pdf In PDF document text
    • https://latgalesamatnieki.lv/files/file/82850923120.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/jegujat.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tutuzoba.pdfIn PDF document text
    • https://asken.as/bilder/file/nifuvejaxefe.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/42926343119.pdfIn PDF document text
    • http://www.ezmoving.com/file/tasonoxixuze.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/14884227434.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/54167004263.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/63877428697.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cab9e4db8---48471079201.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/mutovadojijebu.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/32078238262.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wivopemubizeboduju.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/gowibosuwox.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wekusasenunun.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/22818856018.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/9935605831.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/67937199990.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/gisomazasavag.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/suzizodizokekoxureda.pdfIn PDF document text
    • http://4rrecycle.com/files/file/51430542797.pdfIn PDF document text
    • http://agavietnam.com/img/files/kemezisosexafavuk.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ribelevurigevor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=allwinner+h3+tv+box+firmwarePDF 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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 17292 bytes
SHA-256: 7da95fbd32535fd0a36b6f7cb6ef249cc8426379911492ba5ee7cd33a636378b
font_01_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 10856 bytes
SHA-256: fd19ce4e3ef2e68f234cf41dc8a438397f600f694711a3f15e59375fbe7fa09a
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1