Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a730eeacb3f655…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 12:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05a0dc56f27bc2e8ec8a98a167e2f5e1 SHA-1: 2be07d3b72c01135336412936c082e3f3dfaad57 SHA-256: d4a730eeacb3f6552d15d1245b1572ffc5f9aef8a362905b629ceef032933f62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the structure as a tactic for distributing malicious links, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bhttourist.com/upload/fckimagesfile/31620175620.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/10187318616.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/donejenane.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/97208644864.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/xulefit.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kajam.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/57047781334.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/48182551057.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/12923608323.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jajevaba.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c161275b2e9---sepewiluzupiwoxovalagobin.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/57272437462.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xilolegofi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/25275380644.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/pejazajekunipe.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/mikidosopinofugamezuguja.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1955c90e---78291782730.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/79342756041.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/33217690354.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/32909674160.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/jofegogimefunaked.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/39575558516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=marketing+strategies+to+increase+sales+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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 10880 bytes
SHA-256: 0f645ff2ecaf16b0e01be52c914e5a30a495d3bbe71c5d135e5094dc3aba2044
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 17516 bytes
SHA-256: ba65f4a0b594e6543761452f3180d1751a505b5d1abbe46d0e7a2d60b2ca57f6

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