Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2dc8f3d7c32e7a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 00:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 596adbc4c020b3aff5837869216e3ddb SHA-1: 49c78ff0f3861d86df37d39ce740a9d457f90c70 SHA-256: ba2dc8f3d7c32e7a8d25ce53c25ed63b0ef7677345618be1cf99669c9a3f2878
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm and directs users to an algorithmically generated URL hosted on a disposable domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78292796306.pdf In PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/46593876301.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50ab4b754ff1ca1283a2891ddb50680d/17100823205.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/36195059764.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wewuvutoni.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/kujilugukamejoderiko.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/rigewizax.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/nikis.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/zajenoxajekolufupo.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/81518396033.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nunixuzozigis.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/29254526575.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/naximuxulakej.pdfIn PDF document text
    • http://infunplastic.com/d/files/razasojaginimam.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/4268454266.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gejafufuxitelir.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614060ad5d70d---voxomoziguxisej.pdfIn PDF document text
    • http://jfe.hk/userfiles/nisuzalaxorasefow.pdfIn PDF document text
    • http://mfcpavpos.ru/file/54677671221.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/vadabu.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/14472373213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stream+phone+to+tv+appPDF 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_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 17272 bytes
SHA-256: b41105fbbde9c3b2bcb7bf4d273c11cb2e46264699ae7e73588f2d10e4174e3c
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 10352 bytes
SHA-256: fa740f9d66f0349ec094ad49d9a63b4bf43a4cd0a82c58ee6510cb0b5138aa65