Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2df0e0627beaf8c…

MALICIOUS

PDF

91.5 KB Created: 2021-09-16 00:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84584a7a58ebbddb07b075995edf0dd0 SHA-1: feff8d94b73a448b53c52064b54ffe0114b079af SHA-256: e2df0e0627beaf8c7348ce21b5ce2b0c3c6a965070624bde4519a9f863001902
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://esterkins.de/ckfinder/userfiles/files/21501084983.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2b89cbb2---43856896479.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/84748846706.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/lakerediderameter.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/15490546191.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/juzubusazoguni.pdfIn PDF document text
    • http://jiab.net/userData/board/file/82649080467.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/27220095590.pdfIn PDF document text
    • http://artdental.hu/editor_up/sirogevenexexinoxuro.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/34223266169.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/tozorifosobo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/sodotubufefomezena.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/18500080675.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/66310016081.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/6743282350.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/natiredufusefo.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/guruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fnaf+4+full+version+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 25972 bytes
SHA-256: fe9081c2adca9657b10b71965f3607c8b130811755186c5dd53faf6f0321d971
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16684 bytes
SHA-256: a6e83373aa7f7b77b3a9e2d05f3c5a7b10abfb73ea5c961e959b6f5492de1853
font_02_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 10564 bytes
SHA-256: f62d0eab1fa3e3612529e9c9148971ddd7e57c860e6b99146e3edc236e80cd34
font_03_sfnt_off0001487b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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