Malicious PDF — malware analysis report

Static analysis result for SHA-256 076fe76ceffa61ee…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a909abc6465904e57a7c0bd3bf7b0a20 SHA-1: 4c86b6cf546d5a7087ab80a05898616a59d41e8a SHA-256: 076fe76ceffa61eea1646c64369f7690e579b5c27ddfecc48985c165fc2d1bf9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or spam campaign aiming to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://giant-nano.com/app/webroot/userfiles/files/nalive.pdf In PDF document text
    • https://apra.pl/files/file/53696628747.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kiduvapelasag.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kajilujavisepibife.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/bitogokopinesodezig.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/72216112423.pdfIn PDF document text
    • http://fitviewer.biz/files/file/47921427925.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/50425467348.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92070148683.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/63188444541.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/mexodena.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/bubagevitugiki.pdfIn PDF document text
    • http://remobudostol.pl/pliki/87816766330.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/60528643300.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/15262532328.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/20694651348.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/ribap.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/76722973191.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/romot.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/845108378.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/41629378903.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/42509503222.pdfIn PDF document text
    • http://jarosi.hu/files/file/futorasutipelifivomejunub.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a53e44c---rolegol.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/defaribenud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=duos+android+emulatorPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 17884 bytes
SHA-256: 42b2bcef6dd75206e7002751ab853ae9c33852596baaf4f9c18b2063fc3c48a3
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 10508 bytes
SHA-256: d19b13d9d6179d7b7bd2a1d48b77e86d5cbca4b500fae68d98c4a40e99326bf6

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