Malicious PDF — malware analysis report

Static analysis result for SHA-256 d209ec4b18e36262…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 18:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2af4bac6ceb63f68fa524813cc2368b SHA-1: 6739f389abb2bf83244714877e6785bb86281c20 SHA-256: d209ec4b18e3626276cbec4c3b687d8f13ab5e10d74861a33b0dcd90b473ce24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to deliver malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://angel-juicer.com/FileData/ckfinder/files/20210905_CD86A3BC16CFF763.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/kerulenelaseroxuvubafeper.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/sagefoweroxop.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/55134226844.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/3157767267.pdfIn PDF document text
    • http://szhlfz.net/upload/vitefup.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/38738531699.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/81065226648.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/jovopegiga.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_4FEAC9C0CB391714.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jowos.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/nobetigajegovolaz.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50983295178.pdfIn PDF document text
    • http://adice-area.com/pictures/files/15422029354.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/60251844034.pdfIn PDF document text
    • http://k1a.ru/images/files/file/82289046922.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/5160320757.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/pufemunabadafebuvutasugim.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dekibesafiruwered.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gefeloxemutawazefewiw.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/zulelepitabutelegubediko.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/13120630924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=infinite+money+code+gta+5PDF 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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 16452 bytes
SHA-256: 741ab42270213cdd2cb9fbaf5b5f2a5d4c94e902428da91f4acac5fc6fc8a247
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10704 bytes
SHA-256: 413fc67c48bbd33361c3e6554fa58d190d96e5756f9e2158227f541140957d66
font_02_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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