Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5a8f9f44fade32…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 22:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5c191c050a1dec93aeb13358469b459 SHA-1: 0bcdb7a32aecc968a5436bf2a62d4197aad01c2a SHA-256: ca5a8f9f44fade32ec0af9bccaf9948099e765df1b0fa9d9b29ea0ae3a8c17f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, many pointing to PDF files on distinct hosts, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://globalsublimation.net/uploadfile/files/65140795867.pdf In PDF document text
    • http://royalleasingny.com/admin/images/file/3610254302.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/70538390336.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db3a823d14---75863072322.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/petomizuzu.pdfIn PDF document text
    • http://consade.com/userfiles/file/siwidufig.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/8825241888.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/56768594584.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/zuragemutiroxiniwawav.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/zuranorediludidololi.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/derulapuwatiri.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/76005747568.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/wudokiselarepil.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090708545973499.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/10952777359.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dilawod.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/vogazidus.pdfIn PDF document text
    • https://bawauang.com/contents/files/ruxufawuwakuvazomapeduj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec324e9011---nesenuwosegexivej.pdfIn PDF document text
    • http://njxinbell.com/upload/files/jakozebe.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/21617578305.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/26156657918.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/89363334388.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/ketadife.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/56364972471.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/rakigaketabasatofalejal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=black+player+apkPDF 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 17896 bytes
SHA-256: e2d9c1cd3cebddcabc2820c9ee11e9d6542b2da3c738a79dbf21e4eb0afa3929
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 10044 bytes
SHA-256: 748d6886d02d2f2d7d91c013503cb0fd8d370b3d2cf6cfd709ef61c0f19001eb