Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d99827a3a0fbf…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 00:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ca3106423f9b4e6af7d37e16b76d1b6 SHA-1: 18c5f81599c088f3fd26f964f786eed165e62ced SHA-256: b25d99827a3a0fbf856505099236ffd54531214d824b3f39ee8b618207509c3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=watch+lady+bloodfight+online+free PDF link annotation
    • http://almawred-sy.com/files/adminfiles/files/94623567120.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/893571676.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/20583589533.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/56800075386.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lumafadibak.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/goxefemoxirevur.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/75368786827.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/kefavi.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jasuzurinejezugo.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fekenarevemewuve.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/56938800510.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/57821573209.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/3789464451.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/jifunubitomerunaxogazuwo.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/felokowajajofukanawaxo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wimuvafisibefixogifuvu.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/95935041781.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wonunapavenorebosigatu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/93733878054.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb7a6eefe---17920248474.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/48230941880.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/mipumetiketebosuvaj.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/resipesazegewopozox.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/85144298879.pdfIn PDF document text
    • 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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 10836 bytes
SHA-256: bc6a44e8b4f2403229556a6316e81034e85b94331c9633bdb138532f0e93fd2e
font_02_sfnt_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 14588 bytes
SHA-256: 658eb706bd34f73018015cc79ac24dce431b30ee0abba11c5e75a3a1422b1d4d

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