Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97de52c4c8d6a9b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 18:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1b02e792a6436f3eceebd98e4850d1ce SHA-1: 6f61d66dcdf970f06430ba8fdf21870fcf191414 SHA-256: e97de52c4c8d6a9b23dbc6cddae74dad52a92df4f44990b0e6510693a4ca3523
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=android+stop+animation PDF link annotation
    • http://yugang360.com/upload_fck/file/2021-9-13/20210913234628571642.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/41213397507.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/92088744768.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/44501303691.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7882682bed753b71c54322d6d24fc0f0/livipefasidigatokipuni.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/ketibavafobesuseborezamuf.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/36860449401.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/57897711091.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/tofumowadezokaxopipu.pdfIn PDF document text
    • http://lejonhund.com/upload/29068865326.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/67237188485.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/56817033064.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zaxijileradosog.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/71407419214.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/48562684129.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/sexefudifebukaf.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/kuvagakijixugoji.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901064852930918.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/tojexega.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/tovapuxoneger.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/25138979980.pdfIn PDF document text
    • https://bak.vn/upload/files/sonisa.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_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 10356 bytes
SHA-256: 99ae9f7bc802bbb086cab8a846af36da07cbb630831ace7c87dc156b654ef993
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 18116 bytes
SHA-256: d9c2932bbd2d6c8d10af9bd7f9b6ff7d493c2f72389908949405ffef815d3ad2

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