Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0100aa53fd2fc2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 05:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 324645a4bcd77f4b2a220c08ee8de055 SHA-1: b38fc7a074baec4f2936bc8163c941fd586b8d77 SHA-256: 6c0100aa53fd2fc2e42a024e336848f89b94ef7bf3df5fe65d4757198d56b826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pistant.ru/uplcv?utm_term=sonic+flash+unblocked PDF link annotation
    • http://immobiliareborghi.com/userfiles/files/88572824811.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/94814911827.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/japiniledefaripaxena.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/fewebenen.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/dusuzad.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/xurebilezugaxujifopaze.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7551b3371fcea3a9b84db59cdb0732ea/voxelab.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jixilakidepinusaxodinup.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/12/29322019264.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/22846608176.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/46891313292.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/42312802004.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210913181904.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8648f1f62---14020032179.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/40126668870.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/3880342462.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/nokexamavitogulo.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/90633948981.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/2143191523.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090222070872.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kivibili.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/mekalumiguf.pdfIn PDF document text
    • 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_off0000bb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 10780 bytes
SHA-256: 91660afd64a864f78c4bfae469df1c48459587477b0e0da15fc22ee99bf23558
font_01_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16412 bytes
SHA-256: dbd0fba80f6590170c762626cbb40000b62e22cd897dd6b37edc7ee85cc9d0d9

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