Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b6e6abec3eede9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 09:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4532dc972bd6859406690ab031cad09c SHA-1: 62bb82caad9c2d2d48d4f19b369470111513e127 SHA-256: 20b6e6abec3eede931b2bb42143610bba763ec285f94a960e42bbfcbd23df551
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://niboparis.com/upload/fckeditor/file/1630777680_1.pdf In PDF document text
    • http://toshiteriyakiburien.com/uploads/files/wujilowomikatorujigudex.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/82708260423.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907084805691353.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/95d4d227f5dc6fa56489ee859613e1dd/sijulamubogejo.pdfIn PDF document text
    • https://istanajp.com/contents/files/25572577516.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/17597204511.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368eba596cb---xobofekero.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/57077996540.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/93136933918.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76815462614.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/18040424395.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/85499068999.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/giwopugogogepoparabi.pdfIn PDF document text
    • http://quranday.org/userfiles/file/rajeke.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pupag.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/57836391383.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/semadukelilivor.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902023232.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/jelajoxuzawebiju.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mibarulubulul.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/datujobakobokedewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wireshark+for+android+phonePDF 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 10536 bytes
SHA-256: a0a67cac2c83fc75f71f7008e4ee1e121bc26b5aca0f621e56f9dc56bf23c08b
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 17656 bytes
SHA-256: 38f6f899e9d29c0b47e22b9beda470c70e15fdcd3cde4a0dba2a1910902c94ae
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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