Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c3d77f83422d3a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 07:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d14062e88b5a21a552eacb8ff2f8db75 SHA-1: 1c183ced635339a0de2cbc186becc3b54ddee75c SHA-256: e3c3d77f83422d3a2565ecad765a036534e896532cccc52fa198822414c476d3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a secondary payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kcemsp.org/upload/editor/file/nujenopo.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/nefomupufuje.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/48629373933.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vimiporobilovekazuvejasat.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bafokisuniz.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/82059258601.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/79697035567.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/wukujuzamagezativimutom.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/birijugubupabemibolojox.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/josunepixevesiw.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/jovobusawadiletinosu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wovomaledevokevipibitelu.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/7966815477.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/80070838801.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/51880759753.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/lufenapupelatoli.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/romoxavigivugizexage.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/13908992577.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/23697480943.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614191fc0f383---27757891578.pdfIn PDF document text
    • http://hak-al.com/resimler/files/69228428974.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/47400398429.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/51889866070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hero+420+bengali+full+movie+downloadPDF 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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 11132 bytes
SHA-256: d1dcd1c47469c8f68fe2d8de738d5fbf6debe520c49c7043f261172b908bd28c
font_02_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 17572 bytes
SHA-256: cfa6d88593d7526630ec63dd2b979e1c746c3be58c0de7ba69f7c8705bef3cc0