Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb2e534ac49a7de…

MALICIOUS

PDF

74.6 KB Created: 2021-10-06 19:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 181434c6fcf671641d33a40e9b9da56d SHA-1: 41193d8ff2005fccc03c6932c424eb7cb3352f7c SHA-256: 3eb2e534ac49a7de137b20e6e27a287103e876eb0092ab2b2444e93998cd6074
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to redirect users. One URL, http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/rujuze.pdf, is explicitly flagged as a link farm. The document body is heavily obfuscated, but the presence of these URLs and the heuristic firings suggest an attempt to direct the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/rujuze.pdf In PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/52562088098.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/13873226339.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/vuwalupixupokubamabejotoz.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/mivunedutulejid.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/73883926715.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72565249249.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/66744015882.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/xuzebaloked.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/tulesukiwumitisinuni.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/tunirafiz.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/bojifowasusamewibew.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/72160232523.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/kajogedifutamiberexokubup.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/zulijurawagukiwir.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/gipitogudipumatoxa.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/kekedarusefif.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11e0ae4b95ab679c534ae60f31191ef7/48903687381.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/36553030451.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/vujawajavesibe.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/54810499287.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/8298299409.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/34883855478.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/lobegesoroket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=post+office+charges+pdfPDF 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_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 10752 bytes
SHA-256: c1f62ad1c9b09f1c07890409e212c50d9bb90cf6fbe333c81386266a1430e35f
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 17228 bytes
SHA-256: 050efb2c4f39b0d9cff591f8d0dd2a67798f74d8a0c81eff75cb25a21831633e