Malicious PDF — malware analysis report

Static analysis result for SHA-256 c627d24962ecc18b…

MALICIOUS

PDF

94.4 KB Created: 2021-10-15 17:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a00ebf67bfef1176deae4e658f70aebe SHA-1: 7884491ff8bdecc9e5a393b9b5b529422b44b648 SHA-256: c627d24962ecc18bfd2ba5f2725b65474ab9f5d1eb74fdfb141389478feded6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs pointing to external sites, many of which are likely part of a phishing or malware distribution scheme. The document body is unreadable, but the overall structure and heuristic firings strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coastalstudio.com/images/main/file/42536297189.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/suronokenimobifeduzozobo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6c4b86583102e7583e37c9b493bf30a2/rofew.pdfIn PDF document text
    • https://razredna-nastava.net/files/69023064872.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/17735544209.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/niluruvaperu.pdfIn PDF document text
    • https://rajakedua.com/contents/files/68632643877.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/17707200886.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/lagaboxotamipis.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/letuj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/125ff0b344530ed8f1185643c87d4b74/ludazejoxu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/lakajuremabafigul.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/jijoge.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/dinifakijujedemo.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/85710176161.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/61746821562.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/wodapi.pdfIn PDF document text
    • http://chs.yuanjen.com/ckfinder/userfiles/files/veponobejegejojebaguvovi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/jikoguximirividem.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/nazafivuvikebetikuros.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/43194941042.pdfIn PDF document text
    • http://elitvorota.ru/f/file/satelojinaxekapilo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/54078193039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=worth+to+considerPDF 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_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10252 bytes
SHA-256: cab871453b3ab135fc3907f018c4831cc0bd4bced859520d8ffb96d20bc4d573
font_01_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 18576 bytes
SHA-256: 1883856c132a987b53cdd20a8c44e79e37713b0fc9e4cc8f44ad333a6e6619b5
font_02_sfnt_off00015424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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