Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fca2f8b95db16a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 14:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08b83cd909631ec343f3c85abb7b2cdf SHA-1: 970e7bacfc9dbae7a410b8816edad45d2845b3ac SHA-256: b3fca2f8b95db16a6a93b37174f364977ae3aa463fdeced3c76643de460416ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its link farm characteristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://thinhhoanggia.vn/Images_upload/files/medid.pdf In PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/13396752065.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5e7a3d8---wepotubak.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/loduposevivitagane.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3621153720.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lv2j07m68i44vvq0p99f5hf7f5/kusef.pdfIn PDF document text
    • http://krzeptowski.pl/file/lapojozuminavibadikogo.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/vesinogil.pdfIn PDF document text
    • http://domuran.pl/files/file/kesobafuneb.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/57509621420.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuzuzutolepuzigeritax.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/miluk.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902085603.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/49259687240.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/rumelebigovub.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jufizagejuw.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/kajeviwapopoketaxe.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/sodulelexetovezubogamogus.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/83329671904.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/5372577201.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/lanigifadegaziwef.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/32813188534.pdfIn PDF document text
    • http://space-edge.com/upload/files/xotibikopiratawudorome.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/74596641699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=emulador+no+gba+para+androidPDF 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10560 bytes
SHA-256: 5b9a401d210fb6b091da2906885d6ba7836314d3591c7f2f4ea50af4af8a16dd
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 17584 bytes
SHA-256: bdd4aa9ebb83a58ad46ce2d41fed92315d9550a6eddea947491ddc7876034f3c