Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f3f4a3cf67beba…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 15:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b19d1196088c0014f3f1c17068a7ced SHA-1: 1cd81d52874d3879bdb6e2386c92a544288732f0 SHA-256: d5f3f4a3cf67beba117e44c3e913685dd2215a998bbc41b35addf0ed1632f331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://abwsalisbury.com/uploads/files/29901463490.pdf In PDF document text
    • http://cybernet.asia/UserFiles/File/72065476216.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109042329277106.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cca5893a884d540ee1ac7047e995f92e/30002918378.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614530c1de829---79821125671.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fuzafeme.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/83598253737.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nokujomoka.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • http://goldia.cz/data/file/liwifebusibedilolos.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/75205657088.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/najejinedosof.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/xipadelakuxezaxujogofata.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/xibeluf.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/bamafizedezuxi.pdfIn PDF document text
    • https://sinarwaja.com/account/files/bifaxozupikaxelilojus.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69266847733.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/4973711420.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/jumewerulitewuwu.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/bujirakiveguxixakoluxum.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/tigojonodawiko.pdfIn PDF document text
    • http://z500.si/files/49578631495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=v+bucks+apkPDF 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 17876 bytes
SHA-256: 766a0d6ce05237e19b46fb24b6047831200bd7ce87dfbe7c16f75f4758b68280
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 9976 bytes
SHA-256: c2688617627fa4ba9c448a398dd7156c982c346dcae7e4ca8e70f1880988a6b7

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