Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d7d06e8c3a307…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 00:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 324b3bc0d8fedef6b65ab2e35df369d4 SHA-1: a718f7f2e5da99151da728ed3a3322bba982cca2 SHA-256: d58d7d06e8c3a3074d3fb90b2d3c435c8055ec3fc6ee7f5e0acb6dc586f10a48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adriennemason.com/assets/files/13808585917.pdf In PDF document text
    • http://gocoachfox.com/userfiles/file/18859891930.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/65704047798.pdfIn PDF document text
    • https://actorconseil.com/files/file/86612693931.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/37272558142.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/zoxabavamis.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/59286496558.pdfIn PDF document text
    • http://gazetavk.ru/img/file/41886543939.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/40170149652.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/javeg.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/7085361071.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///62219964807.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/besatedexikitagomu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nutiwiduxuvitojexiv.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/juvewaxixo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/33262033510.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/nerazutitegapoja.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/96876217663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=a+mother%27s+love+apk+downloadPDF 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_off0000b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 19320 bytes
SHA-256: af0357810f06decad74d8dc90545cf41c2eab94ccbb544260da15e2a59ff53ec
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10824 bytes
SHA-256: e1ab46d91f1c36c0d01b9cf475fb42891e2a2aebb2e18827834c370a7caec86c
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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