Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23b7b3db765e7a5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 03:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 291159c71baa7a8f44f249a12018c39c SHA-1: 2454f50559fb18f1f0b683eefd615a6b0e5b36f5 SHA-256: d23b7b3db765e7a541d5cf5ba254a76a3a99ac8423da080fbfd3931ce1b94f28
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 or trojan variant. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a distribution or SEO poisoning tactic. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://autosoftware.company/autoresponders_images/files/53422483461.pdf In PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/78884101141.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/24675198955.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/8284598896.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nebewamedapixuguranejef.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/46957418395.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/dedozubegatazobar.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/58799729144.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/37658056788.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/bazazimeze.pdfIn PDF document text
    • https://ekransamara.ru/files/22018779232.pdfIn PDF document text
    • http://netflor.pl/upload/File/livotofebatasej.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/pamizimewujatewipuna.pdfIn PDF document text
    • http://palami.by/images/file/23789747484.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/renefuwo.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/kevadujefosoxoluvo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/mafiganafobegigeduveboz.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/viseresoboraliwi.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091122055273499.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/dobupigaperetu.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xejisudutaz.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/nasimajibapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yes+god+yes+watch+online+123PDF 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_off0000ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16396 bytes
SHA-256: 3552aa24fe7deb5a168acd5a28625ec167290e34107aaa01f81bad218db60d90
font_02_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 11076 bytes
SHA-256: 13af5d7e25441c690ea85e9a04f949f040b935262aa3a9447483abc0497e4f7d

Open this report in the interactive analyzer, or submit your own file for analysis.