Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b404079af36952…

MALICIOUS

PDF

81.1 KB Created: 2021-10-13 12:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c957c0c2febaa08458a97a8d7c3e22aa SHA-1: ccb1ddd7cd5359f129f74d8c18967f95f4d2a311 SHA-256: e8b404079af369523fee9059c960f70504c7dd53c56c9f60db064509caa3ebf1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many pointing to disposable domains, indicating a link farm likely used to obscure the final destination or distribute phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.velkoobchod-man.eu/ckfinder/userfiles/files/duwokutizozujupexepo.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zelimimijalekaxopoj.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/95022889509.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83884382156.pdfIn PDF document text
    • http://baoveantam.org/upload/files/23046412497.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/56506580104.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/votivifivunosede.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_6DF3378BCEBD8CEB.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/9813729479.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/ropenujanojekefo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/86844148131.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/93569685238.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/lunivegobijumeraxir.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/senovutetiloxuxefajimoben.pdfIn PDF document text
    • https://buka.ru/sadm_files/17674556609.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/49430379574.pdfIn PDF document text
    • http://matras-devison.com/upload/file/789751919.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109190823429443.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/puxojufivovaxoji.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/20366180853.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/lubiverobawuvolew.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614707fc28699---vagavipuvedipef.pdfIn PDF document text
    • http://liluby.com/upload/file/ziligovalukazivarojovefep.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/sudeser.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/50698079118.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=the+glass+hotelPDF 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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 10052 bytes
SHA-256: 8e97ec4d74e27f31e278053010302ec84cfe855d2eb3644a9d8eb5217cf19755
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 18416 bytes
SHA-256: 3e6872c427f759bc0a733be258712819d57548362c527f25438bd7981c32a421
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1