Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33f62c479df18a3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6cb4669b98b5e5eeb37ecb9dce34409 SHA-1: 638bf5abca6f8eab596c017f9e4d48736272a08f SHA-256: a33f62c479df18a379f9d158b26950b1795fc3fa3f22bfbb07f185cdcd9bc966
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites. The presence of JavaScript indicates an attempt to execute code, likely for phishing or downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://laborke.ru/uplcv?utm_term=print+to+pdf+excel+vba PDF link annotation
    • http://eschool365.in/js/admin/uploadfiles/file/38335985247.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/wikamov.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tufizewegirujo.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/doganaginewujok.pdfIn PDF document text
    • http://bienbao.org/uploads/files/26254868810.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/wikaketukoxenenonin.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/70871880020.pdfIn PDF document text
    • http://kmsenior.org/file/files/41663252718.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sejakufujonevonugopuv.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tozekeniwaluxuxikemup.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/julevirubef.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/nalafukilileza.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/80053393786.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/16210543582.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23530955546.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/1539005767.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/43349539068.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/mejem.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/garilis.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/77713567901.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/2626258921.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385037a0fed---20678762207.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/vijipubajoko.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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16864 bytes
SHA-256: 7bfa3e219bad757729aa16460533f0ad1271c4bd1d81d27eefca55b2f35bebbd
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 10756 bytes
SHA-256: 57007a908092cff12312cef063fa1a17c6afa4153bffa7ed20f3d244dd010e5f

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