Malicious PDF — malware analysis report

Static analysis result for SHA-256 caebd150527ca474…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb57d413c1a337460db4faf611ac931b SHA-1: ce7a933b7e7b190e6552fc4f7a58e02aea97d03e SHA-256: caebd150527ca4745a749af4c198007503014d5329ccbc79681461a7f156dc63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from a remote server, as suggested by the presence of multiple external URIs, some of which are hosted on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ardennes.proximeo.com/ckfinder/userfiles/files/taxitovi.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/48770206401.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/puduvetipiwipiwipap.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487ed12f5---fovasapowi.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/19901261154.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/denufikewipefazada.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/48548203473.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109011315483304.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/piregesirazo.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/30175700020.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/xovodovivudekagovebuvi.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/56031607808.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fb6b1a5e95f8ea1ccc8c9aa64c71c8fd/paroxeg.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/losamita.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/vetoxudukosapowozukupifa.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/76270192896.pdfIn PDF document text
    • http://xycrusher.com/d/files/panopudosutujomivakawa.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/40102031043.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/vokoder.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210911_1661C8133BDA21D6.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/93997227479.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/66102721240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=research+methodology+in+philosophy+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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 17384 bytes
SHA-256: 6d77a1da2fe2ed681d7cc9b73dab67994469f7dedd9042b9b5cd46948f179447
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11228 bytes
SHA-256: 79971560b89a57fbe7c26971d5de18833343737896f5f4bb60e978e31aec44c3

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