Malicious PDF — malware analysis report

Static analysis result for SHA-256 d183b0ca3a4af90f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2960c01739889bc61dc21781e8979495 SHA-1: 291fab66fbe416b0fe2cc620ffc360968d7dd4b4 SHA-256: d183b0ca3a4af90f1890c895bafe9adbc7e34aa43e1a380f6782f87008c41ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers also indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dichvutot99.com/webroot/img/files/62231708359.pdf In PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/nifujusuxav.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/61684428481.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/81809294201.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4ef04fc9029979e449eedb017aa5bd0f/vusepinujafovawom.pdfIn PDF document text
    • http://bluebossa.pl/files/file/52422345838.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130c766a2f23---lukit.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/29406179878.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/5144222736.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/xavuzenirajunot.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210913040115.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/konafukatufiselaxufo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/59675711381.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/32730556189.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/60760539325.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/remutulimivumapiwivop.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/66659248398.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/pukoredexijojopikubute.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/68394715130.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/ruwuvufizezajaxew.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/97484262208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hack+insta+account+androidPDF 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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 17516 bytes
SHA-256: ab8374235241a32f62cc556fcfe54ab9b89c78f3009dffb2465d8f1991bccdf2
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10368 bytes
SHA-256: cad693a8c2e0d5599b3f2aea8efe5b96b99460fbc54f56d3d7e8d9fb75cf5e81
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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