Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e43f0815f032108…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 20:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d97ad3d47f67d00b580a058647e582f6 SHA-1: ff3f9e81f70937bfe9fbcdf6e5db9bd4b7a15596 SHA-256: 3e43f0815f0321087843e75f3325d47c566115acd1d8ec678da7048af82bcd1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially disposable domains, suggesting a phishing or spamming campaign. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mundolibre.cl/uploads/userfiles/files/4621474663.pdf In PDF document text
    • http://osingenieria.com/images/admin/file/jetaxabexobatidifuranitu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567f95b3a8c---68193793178.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907104551103.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/14766974940.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344bdb4acc2---74963233696.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/jesevogeviw.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/80496370266.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedotusoratitesivajeragum.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/13095818392.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/dipapemavolugarerenu.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/7062157254.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/69658368871.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/26155780335.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/nurejibonopegoxodexijaza.pdfIn PDF document text
    • https://ptogel1.com/contents/files/tovokimepumu.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/57874289344.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/gapokedukufumu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/74649498906.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vasokinuril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pes+2020+psp+isoPDF 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_off0000acc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 17912 bytes
SHA-256: d99542097936783652d9d41b220a8273f05e8b085329f6e3aa15f4829a267a6d
font_02_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 9980 bytes
SHA-256: c70976ae8eeda3e28f5b074984cc359260710f409956f6493b958530a3955fae

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