Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9e8b3bc270d797…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 09:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f3db07a8c13554d8fe31cd5f83f85df SHA-1: 5fcb7cdecf65c8a5f21765fd80d94a05a10f1eb3 SHA-256: 1b9e8b3bc270d797f2bc8c2b70b627495bfb19dc925c1ac2336e177a19ca498c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jairdefreitas.com/ckfinder/userfiles/files/11281949359.pdf In PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/lebutuveb.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/xokubujidelo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4e3e2f0e315eea11d06fabcfbce02101/41161215492.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109042354017907.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xeramo.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/44776683198.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xubumoxikabuzimife.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/jagejidimixewojedupodeses.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/waxetejupukim.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16415130393.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/wevegeziwefesatoliwuxamov.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gumipuzosutibobumixakuwa.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/bulipaxesagilopuliwod.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/59384690103.pdfIn PDF document text
    • http://erex.hu/upload/file/2943282109.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lewetizatamiminewe.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/65729847609.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/xegufepejekote.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/37668738409.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2ccaco2jc1o02e3f623o3orbl/kozisulexokir.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/popejuwinifut.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/89346570240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=roblox+mm2+values+2020PDF 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_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 10568 bytes
SHA-256: 06c8607dd06d73f900c977d39ae0cfae3365b6aeb575dd9149b169fe7c67d437
font_02_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16816 bytes
SHA-256: c531b4773c503f5924022c8e450a8a2595c3a2a2367b3b10440c2ff86a31b4e5

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