Malicious PDF — malware analysis report

Static analysis result for SHA-256 df90a93e82163c3a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 659f72dd67b27b6e47e2be0887ec530d SHA-1: d6843dffca713bc7e2200ec45120a41a25226505 SHA-256: df90a93e82163c3a51d069e045347b1873d21d74af832727e2955155c17676ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/58154933304.pdf In PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/nitukivotodosawop.pdfIn PDF document text
    • http://samtle.net/ckupload/files/bawiporobigogalava.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • http://yjccnc.com/upload/files/27547548853.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/78890198002.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e8c1feaa---gogowofatezabakuzibul.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/92719464837.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mapawaforobesoxup.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/63835566761.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/5891036803.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vekobunifexona.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/16363479575.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/69943488233.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sudovid.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/31582279750.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/numabazixo.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tuwonira.pdfIn PDF document text
    • https://sainaudit.mn/File/gozitubene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=procreate+android+appPDF 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10292 bytes
SHA-256: ad18fab4718a1e2692d98a32ea6258a6ef8b6231edc31444ba20a6bcc5c9a31d
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 18056 bytes
SHA-256: ea82dcdf015075e2e6c88ef0780000009d7d07e772035c3cec1410d88cb09eb7

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