Malicious PDF — malware analysis report

Static analysis result for SHA-256 68968797b5a88060…

MALICIOUS

PDF

68.5 KB Created: 2021-09-09 02:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83bc87718e17ac1278a40c1102191133 SHA-1: d36c7d77aca9a7c8812550d1c5546c69c8545852 SHA-256: 68968797b5a8806095feb15eac523ab9c5813e28a2db7f50a52217b2b401012d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to a malicious site, potentially exploiting them via a drive-by download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lezeckastenakosice.sk/upload/files/94514366818.pdf In PDF document text
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sonimopiminujaturunixuv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137988141a94---venomegaxuxifix.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131658e05e0b---vulirobomutigatit.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/mavedebajijulufeludeded.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/xokubanubasubuxazig.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/muropifusas.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/dovatinitosixonedekofe.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/zujufutaxunumobejuji.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/48785680173.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/81459859765.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/sugaketezokukijod.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/16000809686.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/rotikegob.pdfIn PDF document text
    • http://orem.mn/uploads/files/48012252136.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/gafobugorubut.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/54800493583.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109010659061507.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210903150901.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/37279484845.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090206031670554.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/57415303215.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/87163034314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=idm+version+historyPDF 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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 10436 bytes
SHA-256: 31736a0ebb0abe1593b5cda0b3ed6f4e9f109566f2b1229bd9f9703b5acaf9f4
font_02_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 14648 bytes
SHA-256: ad996690eebe4f511d6e2795612c2be3f3f5674466eceac7da1764ff539de368

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