Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8949f3c4e4f6d3…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 18:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3e2ebe4f93d535cda054f33c98cc632 SHA-1: 80c3519f5653cececf964de2f944214fd77d7161 SHA-256: ed8949f3c4e4f6d38fd1e165db8090d9a5ea922f6f8190b442c3a9478988721b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests this PDF is designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm strategy.

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://wastran.ru/uplcv?utm_term=the+story+of+x PDF link annotation
    • http://rdmsrl.it/userfiles/files/79897295371.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99650046947.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/25739758065.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb670df0d---koson.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/tovomoxoveled.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/3617716565.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/ranis.pdfIn PDF document text
    • http://samtekelektrik.com/files/voxululevuborajukax.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/18257632004.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/pudatorupevifaduw.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vexelopexukovivezegix.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/binuri.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/18821172751.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/givikirogugavosafemekexix.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/woviv.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/nefuladesog.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149caef45a62---bemox.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/49133082758.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/53324075080.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/37279837647.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/44076286976.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zuvidusirelirewigetotureg.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/26726294140.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/xagizixe.pdfIn PDF document text
    • 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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 14856 bytes
SHA-256: f691fc623f4aae4a052727536bdfd842c82549f9c5edceaa6ae51fed452edc3d
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 10088 bytes
SHA-256: fc294584ab06b2935f5537263c1b3e21a49ce15a35e972ffd1d4e9488399a092