Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8e3b75c3d1eae2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 01:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31dd943fca9b613c6a65132bc2aeb65f SHA-1: 61655cfc34eb235862b9a50499ce68d68dc2414e SHA-256: 7d8e3b75c3d1eae25122d6ef4ce5caf6514c1e15617dd1c6f879afe368e84605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://medvor.ru/uplcv?utm_term=nouns+that+start+with+n PDF link annotation
    • https://gaadalagi.com/contents/files/miforuralopemuw.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/jexiwojilugojegipowujen.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/4488750835.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/82798089242.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/510548232.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/11935790353.pdfIn PDF document text
    • http://ipceurope.be/assets/file/posoweboben.pdfIn PDF document text
    • http://jawarakreasi.com/file/33358782676.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/lebozetudexuj.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a18b929---12071351159.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/37712636051.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/29690274939.pdfIn PDF document text
    • https://agermag.ro/mm/file/jodajifiliruladej.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/62905459090.pdfIn PDF document text
    • http://unseretochter.com/images/file/xamodajaduseluputora.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/biwetazirefilorovif.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vorinepadedi.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/bebanulavomupolavukox.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pososogejufev.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/32860087125.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/guvarodusufomilusux.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nosipinu.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/31367716768.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5ea5f079b8c30837fe61c0c2179fcf9b/73955829685.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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 16956 bytes
SHA-256: 92817d262dfd744347a318bb05eba271fd76bca97fba732c8d89d7d2840f63be
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10188 bytes
SHA-256: e57cd7f82185dbbbe83f0705936a1f1083268a736c613c4ea182a8d0b5813996

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