Malicious PDF — malware analysis report

Static analysis result for SHA-256 8344e1f5afcdb280…

MALICIOUS

PDF

69.4 KB Created: 2021-10-07 08:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 62dedab084a75ded2bb21fe9ce33960a SHA-1: 206819c4edebb69052caaabd7cf4777cf9f575b1 SHA-256: 8344e1f5afcdb280d6a460751351337bb96182b68cf2b67f8724d32f30d12211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to potentially malicious domains, and is structured as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ehomerealestate.org/images/file/belag.pdf In PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/73584551081.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/62088236498.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/bezox.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20211001032431.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/pigopu.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/8124925005.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/83788886861.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/910405fcc6d36da6f02b7162b57f62d6/15963688892.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/18689941711.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210926010804.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021092114371373499.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9b312093e8c0991cc01ac387ab371b1a/17980900179.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/97448720439.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/losunaxelax.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/72456307345.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/3194869792.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/pugiwet.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/tulimowedan.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/6362416574.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/24674188406.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/jalofujupufuwudupun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=value+of+elements+of+artPDF 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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 10352 bytes
SHA-256: 7a453355265abda071c63e5e3ede024a7c4563fc2dcb4b442f7844c1b35d6ca2
font_01_sfnt_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 14684 bytes
SHA-256: 451bda12b6b1b01e6360f9b5bda541d3dc89f6cd69e441e4ec590acbb3e7282e
font_02_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1