Malicious PDF — malware analysis report

Static analysis result for SHA-256 f834389dfefe8193…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 09:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e0008eed77d8c2c60067ec344d32c82 SHA-1: ed8a404c0f1e985b8b6dce2dd098bb709f810f6a SHA-256: f834389dfefe81933f88311a4ffa22a670afc9a5c98b9d57d29a1b57f9a09229
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=virtual+villagers+3+download+for+android PDF link annotation
    • https://brtim.com/uploads/wysiwyg/files/fisawapiwo.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/gavodabekazeb.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kuwabevezususutoj.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/67130121681.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sadesozopapabanejurinubu.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/bapopulutawikarigos.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908195408254508.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/siruwogobodozu.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jugulogezeromewipiduga.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/topiperesokufosirolus.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/kexikur.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b1323602---fasagexipotutozafiwazaj.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xobuzugen.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gimepus.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210904_142500_7343.pdfIn PDF document text
    • http://aven.su/userfiles/file/13094937309.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/64504808325.pdfIn PDF document text
    • http://stonebreaker.at/56655463966.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/32505568914.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/84393507740.pdfIn PDF document text
    • https://afayl.com/userfiles/file/xuxomigisenozekapatewux.pdfIn PDF document text
    • https://costarica4d.com/contents/files/xumuviwov.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/54580328914.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161316c19ce4d5---gisisupugepos.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/vivotekonadudu.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_off0000b32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 18588 bytes
SHA-256: 957a7f458639c69c3f5481867315a4778ac70b0357db93b14c09a85369a9329f
font_02_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10920 bytes
SHA-256: 2068a08d4d6ad52be9b64e49c88e06cbeffc476567499cce226c7bf6cc2bac0e