Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3e12dcc7b1b712…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 12:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ad73e0e06e346b44fdd17a8de1f6e53c SHA-1: 454a73f5a9005224bf8674e944bc49876908ebe3 SHA-256: be3e12dcc7b1b712f5db08d96b48c384e1abaf2a4841a00c13f3182cd411f40f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fnathservices.com/upload/file/52399820952.pdf In PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21251993634.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/19614401791.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/xonobuduxarigapigovojovig.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/38979683356.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/lizuxoxumol.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/bilakixo.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/20367459212.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/16367710106.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gamamonuvugib.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zomabivopono.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/40490230796.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92c25a7fa---norojixujexonadiw.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kva5smlghkkjht5rrept255e76/59742270927.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/73059786748.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rotisizebarepo.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/44681005773.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/japomolenubalinuk.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/99679598932.pdfIn PDF document text
    • http://wwstationery.com/files/file/22825878260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+unlock+phone+with+another+phonePDF 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_off0000ad76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD76 10572 bytes
SHA-256: 81119773d2e502cb105499eeded61cf8d5fea818a0cf413676e43e9915869202
font_01_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 15404 bytes
SHA-256: 2afb10ebb29f28c77d5bdf207119cfc8b59d6b1e217ce2b0fc90162bcfde8cc3
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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