Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6c04ad005365a9…

MALICIOUS

PDF

80.4 KB Created: 2021-10-13 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d55049c9c746de70b02585dda7db48a SHA-1: 522710f861f97e9549374c76aed35ba2e24202b5 SHA-256: ea6c04ad005365a9170ad1d19155f81d1fe607f6c6e3ade8c7c64170af4b619b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially malicious or disposable domains, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://j1ent.com/userfiles/file/20211010085329.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/buwoja.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/ruvosatotatat.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/28807743501.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630978013_bd50d7a1e4.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/pisigikomawetenejugirif.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zukigodezevikofenenur.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/82579014034.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/xozipelezumijetuwofolewad.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/bizonomovarofuwug.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/jobobageferevelopuropo.pdfIn PDF document text
    • https://kawanmto.com/contents/files/gesotejitigeguseta.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/47931038703.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/50559178399.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/78770507328.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/dimosugidagitipogokine.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/22633879940.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/20618509771.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/xufezadurinisusavosim.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kojepovalunefusutoto.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/telam.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/37040539568.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/18450953127.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/jeromaxulerusabezagatetu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=my+3+single+sign+onPDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10204 bytes
SHA-256: 7902e91b05fc697a37e9a76acc048375509994e57dac80ea69e5d7c4cc6d9e84
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 17972 bytes
SHA-256: fc322cf7a56179c83180f1899b632ec5620a2eae9e913b9fdc16ace2044e8faa