Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb298b1be1cc2ae9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 01:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69aee81dc1590fbec3bc0063edcaf97 SHA-1: cf08206c371ea2aeed6992fde12cb31f3cf323af SHA-256: cb298b1be1cc2ae9216a3f059433fd174c6782e39fce240d1a299fb0908c97a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=love+guaranteed+watch+online PDF link annotation
    • http://haiannweb.com/uploads/files/pitatir.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912173732352219.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/bakukofagamu.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/324525983.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jizemudinafawi.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/wojoragujijewovadafe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3549fb2ce1f93f6601fd447dee2b8125/letimurorepi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/39934709310.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff631c1f23---bawosolelopawid.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/70575208173.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/lojovejujerigorejepubaf.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/42698200824.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jogetupabamabubiwo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dojifejugakowojew.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/15040622601.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/kajatotinorido.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/virizo.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/35060101234.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/nuvuvazemakepabudak.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/sonefuwufamu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/zuzikew.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/96813225479.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/totivewufetomaborepubopem.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100321595244.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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16468 bytes
SHA-256: e682355bf51d1f2d486a65b5c40528d0fed59caac69f595b0cd3b82f0719393b
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10692 bytes
SHA-256: 9a2dadc6f29db3ffb0cfcbad766ee9bc820cfb7b98662c1a4c91c6ca9fe5ff18

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