Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f2f93509e890f4…

MALICIOUS

PDF

83.3 KB Created: 2021-10-10 21:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d27aedc0f7055c8e475499e3b2764fdc SHA-1: 6203c8662630687320c85fa0d4b2a17c7c88de1b SHA-256: 38f2f93509e890f494f19e2d1217f3916aca8cfe0ee06756b2281edca7538072
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://lescourailleurs.com/upload/editor/file/voraperorifalorotokipos.pdf In PDF document text
    • https://home-consult.lu/userfiles/files/25075776581.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/58514971184.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/71647873614.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/gikonakadi.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/72400986897.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b9101fbe---9445079592.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/29706605170.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/89672713483.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77134042659.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616162936a2f6---banix.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902155224.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/36652973415.pdfIn PDF document text
    • http://paradoxine.com/upload/files/pabulugi.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/pizupebafexuzeminiw.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210917_361B410EC1160970.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/55518183579.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/rezamogov.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/sabatepixaborufid.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/11161393664.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75425817894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gay+relationship+quotesPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 19528 bytes
SHA-256: a0d2115991c7a3248cb02d7e1a0399e5136fa5a19507d1c6c3412423167b3650
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 10748 bytes
SHA-256: 851d48b243683b7ba951bc490da82a5ffde0054878c16b7a48fbcd4beaa57d2e

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