Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca9216a0e748584…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 03:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f87687affe8d5b9fc652dce4d19d6e83 SHA-1: 39c2d2eb7252be19bc0b8f3c6603894a6150f180 SHA-256: 7ca9216a0e748584ce38f732d9ab15785d451de9b5aaa6bcf81bc861063578a7
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 suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://madame-tina.com/ckfinder/userfiles/files/kisesanisimudagodorof.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/sizavewofafodowodo.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/mapodifuwapil.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/63828751715.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xelanuxilolu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n6l8tjdh9g0ihupgk6tvhgvo15/10002070282.pdfIn PDF document text
    • https://hoalavender.net/upload/files/87775472795.pdfIn PDF document text
    • http://liyangah.com/Upload/file/xajasiro.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/60538045757.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pipavusipo.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/vidowekupabubewazorik.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/30993637754.pdfIn PDF document text
    • https://turbooto.vn/upload/files/basogibidonamiga.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/lufabokonosekanu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/pabugewaxuwum.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e814f4ba87---82885187298.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/399870450609e120dd0981.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/68016822195.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/41624518691.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wuzozujeneded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sociological+perspective+on+gender+pdfPDF 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_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 10936 bytes
SHA-256: 01b516a2a6bc9824e9d9689505fd00b17b2a2cdda91427cefa303e2cda1b7827
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 17132 bytes
SHA-256: 5b121c9c6006391e660657847b97eb271ca062240de5b77ca5a8d2439af1d96d
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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