Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5edc64d8af3478…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 18:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d295c04ba47a3ce62ba55edd9e375443 SHA-1: 3b47ce37468641f73a373d7b1488c08e3efb93e2 SHA-256: 1f5edc64d8af347826f72a9441cf8893b6f6fc417d0983534ed8616f1a8863af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pixomot.ru/uplcv?utm_term=android+emulator+vpn+connection PDF link annotation
    • http://jfhcoaching.com/userfiles/files/44098060923.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3a584e7b---jogowukiweworidepinuwex.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vesak.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jorabewududikanafip.pdfIn PDF document text
    • http://www.moulbaix.be/fck/file/pabisivena.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/pogute.pdfIn PDF document text
    • http://teresachild.com/upload/files/jabazokewefasobuweferon.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/67770520921.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/56911164302.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/vasulekafipefuvobide.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf3e10536---xonupapewapifafagodinufot.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/mexiwubukojoganizadujaxo.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/juvafekedetudanabu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/40777910227.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/89529152498.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tulizuvataweji.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/fesanu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/43115514731.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091823520251.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_off0000ad81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 10652 bytes
SHA-256: e0d2735c2bebc80556722719e2987bad21e6a7b3de0703c6d33c19f4ddbb34b9
font_02_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 15716 bytes
SHA-256: 11a66d0834fcea92e1867f5f0c61cbd93849436fd2e9d92b219875daac9604f7

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