Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24e2364b02ff68…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 04:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 000530f6e1c0935ef942997c83978500 SHA-1: cbfc90080807a7d72e79957aaab81a5ed601e80a SHA-256: bb24e2364b02ff6857bf2b6fbe8230a288104ee0dd8564c3ddaecea9ea8a30b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites via the numerous extracted URLs.

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://kondicionery-krasnogorsk.ru/upload_picture/file/50436194115.pdf In PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/78912242126.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/27723151022.pdfIn PDF document text
    • http://01host.ru/userfiles/files/nivif.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/56398837291.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/34533977862.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/64863053937.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/rovozimizizivutene.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/gagukegatanulabexisixamo.pdfIn PDF document text
    • http://dhf-china.com/d/files/vawetilinub.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210902_235119.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/17223210786.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/gakenel.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/77967567530.pdfIn PDF document text
    • https://reniuved.it/file/17150772546.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/893571676.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/bixamepedeximejuvowu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/gavawuzo.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/roxuzerux.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/59839296031.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/43185670388.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lamegek.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/40774063198.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/89737207309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+hacking+applicationPDF 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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10660 bytes
SHA-256: ae0386f5cbbf54734d8edac39fa076762310004091091c0a28c0a4248da91f1f
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 18160 bytes
SHA-256: 8ccdc7baa707d883b96edcd637e72ef88204ca7605c08ffb735cc9b0b48f5235

Open this report in the interactive analyzer, or submit your own file for analysis.