Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5cd247024f81af…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 00:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71889d597bc4c440aab20b00a5cd7c4d SHA-1: 7b7394a1d07e5828df6087f2994d563ebf27233e SHA-256: af5cd247024f81af4783fa6956a5d964ce66903b101f7d5273572aa7fe0006c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=power+and+conflict+themes PDF link annotation
    • https://shinko-tw.com/UserFiles/file/gazigelorekanekab.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/xelax.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/8075356286.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/81492644371.pdfIn PDF document text
    • https://priscar.com/documents/files/77379746457.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/55429037994.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/22099275264.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/37204185255.pdfIn PDF document text
    • https://titishop.co/upload/files/97866810722.pdfIn PDF document text
    • http://packamate.com/userfiles/90191460587.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/resivuworigadu.pdfIn PDF document text
    • http://fruitvita.com/files/files/37339669963.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/7558551616.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe706dc9a7---12939539135.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/rasalufokuru.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lotidexop.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nenunolax.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/87319467215.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/70803978417.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/69946807871.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nififopeb.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/20211938459.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/lifekefuruvobim.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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10828 bytes
SHA-256: c69e7497231332172349bd7fca0f2febfb6f7e28f7851bcac0cfc8f588b1770a
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 18348 bytes
SHA-256: 77237a084e49df42f446b6c58bd0599f018e09bda9f978c8fb0c43259f7eb45c
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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