Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655aa9eebf6c196…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 06:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ca6e71830296e72d2ff38aa39f8134a SHA-1: f4ac52caaeccd83d7567f771f314e9628f4e6869 SHA-256: 9655aa9eebf6c196927a2b0b57f6e27a4f95358a0f43b60920044c554b867037
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to other PDF files, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://holcom-wd.com/webroot/img/files/47850371492.pdf In PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/41150615757.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/93666160547.pdfIn PDF document text
    • https://andhimazhai.com/images/files/77731724013.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/midafuwida.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/34805796470.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/zazadeguxenedojuduve.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/50912608279.pdfIn PDF document text
    • https://telenovella-bg.com/files/76342086746.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281644b6f0---22941296921.pdfIn PDF document text
    • http://starma.pl/files/file/64318771662.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/70258281456.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/97850714824.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/gejefubadata.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27000151357.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/badozudi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/firodowesilu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • http://djpress.pl/Image/files/42276968933.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/dutifegugebi.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/81607347412.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/67814420045.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6178928572.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/jakisipi.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210903230208_kpf62l.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c75e5899d---43542468720.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/filotugozawagizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+fortnite+code+redeemPDF 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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 10236 bytes
SHA-256: 602b40713164129551105ff73754c36d93714c97b2d5dee171b03d68a3722abd
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 15056 bytes
SHA-256: 0db5214344375e15c9349e789ee4c8e2f92d6d2b59fc038af328a5cd717b01f5