Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85f4d7f3851910a…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2702b36b7744ff3ea950a689107b4b9 SHA-1: b88ca45a2c922b2592e540956e0a75bb17dbac20 SHA-256: e85f4d7f3851910abb3361b6c6e4a476f7f47a7a857363d0b6dcca1e0d89e264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://krisoc.ru/uplcv?utm_term=a70+one+ui+3 PDF link annotation
    • https://aljuboori.com/userfiles/files/38931662015.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/maxipiko.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/jozupej.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/vizogubirubasinaj.pdfIn PDF document text
    • http://castel.lu/userfiles/files/dawokarupepi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/44024468859.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/jixizafidulumaxugoganexap.pdfIn PDF document text
    • https://bdata.vn/upload/files/34782235739.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/17050216754.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/47660903685.pdfIn PDF document text
    • https://phr4u.com/files/17307142000.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/xovupasokefewixume.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/semafufiduno.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/23789537801.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/daneliv.pdfIn PDF document text
    • http://arablift.net/userfiles/file/didiluseb.pdfIn PDF document text
    • 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_off0000a7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F5 16748 bytes
SHA-256: 4706833cfc429c3f1516525439a2233f327d855d0b1fda34a9c60785f782a8ac
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 9952 bytes
SHA-256: 553d2b2ebb0cca2ad081a669c16e2f9257723b005be13fb68e485d97907ba200
font_02_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.