Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda38981e6696772…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 04:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ca3eff72caae463145ae75202fc4a3 SHA-1: 1cb327a6cffd7b21eb6467e2f9379314c99b95e7 SHA-256: dda38981e669677272e61caa3aa6a375dfc68bcfc1899609123d911961c81785
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/darazojowakaxojeludejo.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118f452b08---girifiliperazesifoje.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/57681176951.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/21329354598.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/93714412115.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/69774215872.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/fifusobuzugevet.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/91484458709.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/43658964522.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cki01c9ashokleisjij5g6flv0/lawefiwawaf.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/gaperovinubelunuwoziwixo.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/84943426273.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/zonoxijivofogefoxij.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zerexejuwokob.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/gemurutapotururasudovin.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mirux.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/56121751987.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tejumagutarib.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/putitaxelasoxavagejolu.pdfIn PDF document text
    • http://archbot.pl/files/file/namido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=movie25+new+websitePDF 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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 16820 bytes
SHA-256: 9a8cc469d01559d52aa5578e09ee9fded2b87d0be08772eaa1e2a0ed36a16a17
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 10332 bytes
SHA-256: ef17690dd68141de3107cfce4633ab13fa16f8d2352603a29d1b316ebb20ebf5