Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7404c8a0b4d5138…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 23:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fb3607ab95208c23126f60d5903d0f2 SHA-1: 2a2c9e9586552bfb207d079991e577a3181a9fba SHA-256: f7404c8a0b4d513854b897d0a7213670ce75362369a1047a11587973e62e22e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--80ag1a2a.xn--p1ai/files/file/49668277966.pdf In PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47353100910.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/84122832296.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/36880656831.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/46006250586.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/51842200323.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/3769262595.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/xukonixujumezavalapinabax.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/28878300067.pdfIn PDF document text
    • http://retailcop.ca/files/rosizedej.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/4018726741.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090803005832.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e0dc625826eebd068ab42783c83a7f1b/8818248870.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pisoxapezelod.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090805292370554.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0bf807a8---27914717097.pdfIn PDF document text
    • http://arsvet.ru/img/upload/nolokuxetisabebupawa.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gizawisitupiru.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/delawijavajaregilurez.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zijulodejeweb.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/duzolo.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/51071667260.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a678330f96---99875112467.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/52217336233.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/757838221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=yalla+ludo+modPDF 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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 9796 bytes
SHA-256: c837558dce37d9b2a7297e90c521258a9404db76484cc552247c4c55b4e3b87e
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 18292 bytes
SHA-256: fdb45aeb538b8994aa57ced4d4fa818026e705a296364ef7f3382c1a73d5bf82
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1