Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03b64f12faee76f…

MALICIOUS

PDF

87.7 KB Created: 2021-10-17 10:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41e52f86841509339165fc7c0a5e740d SHA-1: 0ef63eff300eb7f82a843e77b14e4772eb6eb579 SHA-256: a03b64f12faee76f9e01664fabc687051184fbc9d60e648cf1ef30f750e04075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vdadanang.vn/app/webroot/assets/files/rawuvuw.pdf In PDF document text
    • http://laiyi-art.com/userfiles/file/disitipodifamisixizemuvig.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/totaxidopinomemes.pdfIn PDF document text
    • http://hotechike.com/files/files/56490216674.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/43011370148.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/lelabi.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/90024231500.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/gosababawuzaganegudomewof.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/wawunujow.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18abaf40b---11550371740.pdfIn PDF document text
    • http://robbes.nl/media/files/95640499349.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/marob.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/59236595147.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/51243994159.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nifimaroxu.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/xunekupowegatogeje.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/63799228907.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/degez.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16158ec5984252---milotib.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/488496064.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/56850336108.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/94849297784.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/xewugodakatelurilatiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=river+walleye+fishing+from+shorePDF 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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10876 bytes
SHA-256: b938d61a97414e71bd6e4f9ffc468ebcd8d2ee07ed133defbe4415282194e345
font_01_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 17276 bytes
SHA-256: 3db30ac0fa98198b6ffea8c8a32a4f0d4cf9ef778116b1ff564882418fa8ee67
font_02_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1