Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df250bc70f8d6b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 15:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cddf9d6d3967a2907a9a67b8a5ea7ca SHA-1: 3802bc49eeb8bf70b184b9bd00a881aa29717764 SHA-256: b3df250bc70f8d6b5ef24689b1924aebeee64163951ebd58a30a57b2ab33220a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://beijingteye.com/upload/files/fepotodefelaxusape.pdf In PDF document text
    • https://tonymusic.se/UserFiles/files/54119294595.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/36107896179.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/32869847313.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/memuzovumofuzelopivaxu.pdfIn PDF document text
    • https://tavio.ru/files/file/vojobiledoxefabukuw.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/norasizar.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_5DA6F44DB66F94DE.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/fuzupup.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/58dcc7e4f2e1f73fc10b0cbc4486c5fb/dixefenofelomibo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/90634180814.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/nunebukubif.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/toputolu.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/10574906492.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/37500791069.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/46563896779.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/satagomowunudukodonax.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/datokoraxe.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83872242088.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/5132955009.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20623889315.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/3762353984.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/3244957951.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39557868644.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/25775885116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ratio+rate+and+percent+worksheets+grade+7PDF 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_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 17068 bytes
SHA-256: d2caa82a1a82dd4778f2355c560d4b1f4118c6df9f57000c8eb841619a85c666
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 11020 bytes
SHA-256: 8b434f784ad770029298341c86994e027d9b80ec069deecdfcaa77a3f46af0fe
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1