Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfe9bebc49aac6a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 21:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac4e6aea395041e850ef23d0a70b0035 SHA-1: bb128102a54165e97c5e3a3df135ea03da03f540 SHA-256: acfe9bebc49aac6a2ae6029c2fa211f7b49d82bdc4e4c5bc9c068f95ffdec3ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://njshore.drinkpoint.com/uploads/files/jidaxotolajuvizeve.pdf In PDF document text
    • http://humanlitech.com/files/files/turis.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/morusez.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/26076952460.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nejalagabuwopotejuv.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/65453968748.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jetosapu.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/33860458025.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/64328669829.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vozuxaf.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/67584160553.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5a1d2cac---nakedekofewojarekulije.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903073101.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/rodevorutatijesovo.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/57550203995.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/94842280176.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614374d2a7647---279932054.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/16781717642.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/77290928323.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girufob.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lubunolegupovebalu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/kumolug.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/53535145183.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/12774879035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sports+heads+football+championshipPDF 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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 11100 bytes
SHA-256: 0d5a723d7303049656686cb4b8af766e84fbb9feea2e22fdda879b1fd74112a5
font_02_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17760 bytes
SHA-256: c91731212651ecab67312432f73b722b836ee8a407992cf16cd104c375811de4