Malicious PDF — malware analysis report

Static analysis result for SHA-256 d732a07b0e2572a5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 23:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f41bc0a66e0b23f17d6b5a0aebf3d52f SHA-1: b6e8265ff184cdff84327d7b4d69952374d94af6 SHA-256: d732a07b0e2572a5ec787760678f37f40492c1c504a754f3c2d16af0956c8879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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 http://ruihuitax.com/files/file/28248317342.pdf In PDF document text
    • http://tpt.taipei/asset/uploads/files/58001375847.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172074cc12---gorafiwiwiveve.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/powojofimapeguw.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/mawuwoxubijasinamosexemi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/95018325061.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/wosotirivugi.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/nukidilas.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/na8dcv58vltiaqqt34ci0h2ba6/58787770654.pdfIn PDF document text
    • http://standdominica.org/files/files/48826268963.pdfIn PDF document text
    • http://tzsunup.com/upload/fapowodumadozefa.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/sibisedaboruzin.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/jadanikusunasadud.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/29438282585.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/bikepejodi.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/godalazi.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/5289160497.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/fusozukaf.pdfIn PDF document text
    • https://o-dance.com/upload/files/logevo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/16229213079.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/54476228913.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/82843982913.pdfIn PDF document text
    • http://vswet.ru/f/xapelidebigizevoko.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109271352481319.pdfIn PDF document text
    • http://standardamulet.com/files/files/43703141254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nonfiction+reading+comprehension+test+hummingbirdsPDF 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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 11240 bytes
SHA-256: b4154b1c51c704d80896798d8535165564c0bb6ce71a0e4c4093c307fb151838
font_01_sfnt_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 17328 bytes
SHA-256: 828952b2b42beca417de2893db2cca82b99c4ab5d13acaa7a609f142d7035c0f
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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