Malicious PDF — malware analysis report

Static analysis result for SHA-256 c094383026ed3795…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 07:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5118cd5d9652d0f7e2171b88e6bf63f9 SHA-1: 1ba57b20f17cfeb479ce57ce77a1efaa14efb663 SHA-256: c094383026ed379565dede71c2d23ee162f1b098a79c8249baf0afadee620d62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=wallpapers+for+htc+one+x PDF link annotation
    • http://toitureetfacade.fr/data/Files/putug.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/lejazolawejuvinuku.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/18578767641.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/semopinogigupesolutu.pdfIn PDF document text
    • http://poliinc.com/upload/files/silurovugapotixudabukob.pdfIn PDF document text
    • https://somogyplusz.hu/files/48637219067.pdfIn PDF document text
    • http://shahgrp.com/uploads/37710970688.pdfIn PDF document text
    • http://findusafranchise.com/files/files/tejemanimisugaparotewot.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906215216.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131679738548---69206175737.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/50252697908.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f6e1f95b85ed4db0f8e34f0e47adf973/54373677839.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kamifanimebolisifix.pdfIn PDF document text
    • http://cwesp.biz/upload/file/makifat.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/81204693119.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/90434327286.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wazevotifozuverolevo.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/17455533305.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/37193544660.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/13328794125.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/datunulo.pdfIn PDF document text
    • https://pmms-online.com/assets/file/44705224391.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/nujakob.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///78558156231.pdfIn PDF document text
    • 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_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 15996 bytes
SHA-256: 792bd52fbba659044e67b3d458cd413e36ea2eaa6e06932255388e8e3bcdcca9
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10580 bytes
SHA-256: 980ddd14a2845a6e32c95ba981151887020b3f74da7d893cfe0673ab0a248898
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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