Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b916780ec3fa90f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9f3b4d7d62a6dcbd7f495d4b494f1c4 SHA-1: b03e1d083609cfcdc36a5d305bb0a7a4631eb142 SHA-256: 1b916780ec3fa90f028124a3d95d08571189da1b463362e0b6cac19b7b275762
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing document. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://zhjpharm.com/upload/files/92130927190.pdf In PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/pinamukenojizokopiwev.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/fagifopiwaxepojodemi.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/79974580963.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/66011336634.pdfIn PDF document text
    • http://jainfarms.com/uploads/kuxegirotev.pdfIn PDF document text
    • http://kahasat.cz/data/file/guzumijoxoruposopotax.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161426607246b7---fekof.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/begifizabato.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/54790796678.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/35540734566.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/35867022910.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sogenotegasogotase.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/bevezibabapowa.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/rutoboxezodoxozolege.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/miwesufexapugowofipo.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/98289572775.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/89710925248.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe33e74d---roxajowinogabasanibotad.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/loxof.pdfIn PDF document text
    • http://smartcirclegroup.com/userfiles/file/nuwuwabexumafa.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/nedazowumibum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=1917+film+entier+en+francaisPDF 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10552 bytes
SHA-256: baae6431466d3ba770f3bf63c845afcc3bcfa7ebf0c3b1e23814c760ffd1cc6f
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 19464 bytes
SHA-256: c25203d96230482c125dbfdddefe8589366f6159a5baabb5711d98bd0de73f6a
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1