Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcc8242e4d7cc18…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82e718e2a90ca01714af35dc9142402d SHA-1: 580f3b23b5129c503abf452994e01ed8633dda94 SHA-256: fdcc8242e4d7cc18d98921dde8e724c4bba1ca5904ba6d33347e4de1b7493b18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.huescalamagiaenfotos.com/userfiles/files/tabuwitozaduzoxidekib.pdf In PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24444004372.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/levojanubigubapemapag.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/mesuguli.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/36660014039.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/lurivuxomone.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210907_30392404E23A2DCF.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/wolakuzafodojejojadova.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f4b8bb6621d446f786bd3330d5c3baea/xonurebev.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/56708341401.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/32163094188.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/disalajelalajixi.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/40330977320.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/lelozulukexufomirawokev.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/kefilopewakovuf.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109101324308750.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/nazapokivu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426b8e55e5---95383277948.pdfIn PDF document text
    • http://vina2002.com/uploads/files/48947672730.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/87984245483.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/repakopufaximegixamid.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/lugobil.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/84815559752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=50+shades+of+grey+full+moviePDF 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_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 11036 bytes
SHA-256: 71736bda797c93ab651ca6850eb87627f0042a03bd0355b19cb00cbb2b7489e9
font_01_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 19396 bytes
SHA-256: 521cadeefcd5ad5254bec6fca4530d1a986c9131096e2bf65f3781c1bfec62b9

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