Malicious PDF — malware analysis report

Static analysis result for SHA-256 9334a05cdc50f905…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 18:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea6727154a7a7eebfdb99e653023cae3 SHA-1: 1a9d3f8b350a0601e9cfb8685dee9e26cedec21d SHA-256: 9334a05cdc50f905a6a73f3eaaf923561b789236b84002e9a220053fd4278cc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of external URIs and the link farm heuristic indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sahamit.net/userfiles/file/pawasebubis.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/45291804015.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/89481693429.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/6579621744.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/22779306098.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdfIn PDF document text
    • http://agrion.org/upload/fichier/gidefusosovono.pdfIn PDF document text
    • https://digireg.dk/upload/8105238637.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomemanusevesi.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/ladudezezov.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0ffbb1e5b3378450a5cbaf998c444a1a/xepafim.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xobifudimot.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/38716704008.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/jurufopetirum.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/59924856660.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/27249393368.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8vk3ggkrnqjr4nv3vntn9g8ka3/kerefavepij.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fobekejiwe.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/xidoragusuzafapuribuv.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/23422763616.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/buvesep.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/fenugisevigomape.pdfIn PDF document text
    • https://webmenuplus.com/images/file/54084743642.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pewesebetedejupaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=super+smash+flash+apkPDF 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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 14796 bytes
SHA-256: 64899fff9c7e3c5d1adfa14588336ac7dd8a56b0d8f4127a922e7732c995ebca
font_02_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 10476 bytes
SHA-256: 0ae8c0915b055c9663f9c68bfad3c822dbad36dc1c0669c740b62692fc730912