Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fe0f12e33eeea1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 21:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ace909608002f47dde3563634e5bcbe5 SHA-1: 96fe0ce81b62e0bee8e6feae7e959c8a0502c395 SHA-256: 99fe0f12e33eeea102eb1f2ebf28c4c04d3093bbbfa7e9eeab1a6525099e5399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84828482944.pdf In PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/54700161268.pdfIn PDF document text
    • http://come2menorca.com/images/file/tazisezeguvad.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/piseniwebor.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kodireraguzorel.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/fupazafivenuvovok.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/subiwilepatuwuke.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/17442074805.pdfIn PDF document text
    • https://phm.vn/upload/files/70156404283.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36330401846.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/86962291279.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/titilanavepoxo.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/setunupekeku.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/35326681802.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/987c63141c9a450c9303aa30954f06b6/76783562308.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/dededuzasidigadi.pdfIn PDF document text
    • http://yibetter.com/data/files/gapitopepafam.pdfIn PDF document text
    • http://tzsunup.com/upload/90781525427.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wutupibovigumimibetasa.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/18786183705.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/67602850396.pdfIn PDF document text
    • https://educhina.mn/editor/files/30414301899.pdfIn PDF document text
    • http://373113.linker.tw/files/10633525810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=herbal+medicine+for+cardiovascular+disease+pdfPDF 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_off0000b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45E 16248 bytes
SHA-256: 47e937406586c4080a48f74fb2454e88d84a5c5b287078179c136dc49196b478
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10980 bytes
SHA-256: 41067551471fd74ba298b5405870f838fd1f502d856620a42c9ae16644f602ef
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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