Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f9f98b2c2a3f70…

MALICIOUS

PDF

93.7 KB Created: 2021-09-13 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 521180cc0de0c21148d099ff86506cf9 SHA-1: d2bed30ec23807b9d6445e81e9c3ca8e70334291 SHA-256: a7f9f98b2c2a3f70d3f7de0e478b6bb0ebafedda6859736f8fddeadab110c05b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files, indicative of a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pmapmc.com/userfiles/image/files/dibejuxipilap.pdf In PDF document text
    • http://metabolitplus.ru/files/file/96363848541.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mopiwopegotusexu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/neforakivejetoj.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/rizepolex.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202194146255257.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210912163142086240.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/97717931745.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/sogudebupakujusu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/fexokuzuveneder.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/porisasilabawi.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/saxixujadapexuketaxova.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/24169813677.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/zakidizonut.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/nokepigufugazika.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/6692916259.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tulexapokijivut.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fimosukifoxewasum.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/24682313895.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/roloza.pdfIn PDF document text
    • https://soechi.id/userfiles/file/doruz.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/51728322692.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd6c6aa5f---43721908911.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/82402293719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+smartwatch+2019+androidPDF 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_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 11192 bytes
SHA-256: 6a44d950815a31e76dc51b785e4196143933f78c7644be270a1b7cbe2cd884e1
font_01_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 18652 bytes
SHA-256: f96534310428f212497462d0ef834f78bb686751c7d1249566a3dbb3f159ef5a
font_02_sfnt_off0001515d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1