Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faecf96674cdd04…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 12:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab58d6b54704df5f3c617b3716549297 SHA-1: 05870cd7825ad25661761f0e9ce3bdb7d403679d SHA-256: 9faecf96674cdd041282130651c721a815b9a7096b79beaa5a1b7239b83bbc3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a 'PDF_URI' pointing to a URL with a 'utm_term' parameter, suggesting a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute links. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=clinical+microbiology+textbook+pdf PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c0e4ffr8kvs7d5adf0vrbjsp63/63386272285.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/wemugazomariw.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/zisimomowiza.pdfIn PDF document text
    • http://capri.lt/userfiles/files/43364945272.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210925_D423D69CAB7C8D62.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/zegivit.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/sawavikal.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/jexogagelote.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/52861305913.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210922181703.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/35782704876.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/kelifupenoro.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb88d1b693---56092757856.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/669907084.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/nogak.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/muvokevabe.pdfIn PDF document text
    • http://huefpdf.org/upload/file/54719648487.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/32009876187.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vufifuduvegebisavedejanap.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/wusenofuvoxu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vutarevozi.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_off0000ab09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB09 11272 bytes
SHA-256: a73bfad3aeb9bbc6d8bf974d8e0638fcf8224de4449a28c7bed1229b659b2e7f
font_01_sfnt_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 14960 bytes
SHA-256: f541f6180677e2283ffaa0d68f1951b2c6d054c38dbd118870f365c787afb823
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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