Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f78fb5f251352ce…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 19:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e267c6e4e259ae922e88e6186aa5d14e SHA-1: bd5f1db058b0a43a173a5343a145073de2ff43d7 SHA-256: 0f78fb5f251352ce043dfd80a1662921045f218f863bc5a3140d9bad1c3302b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains or link farms, strongly suggests a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://royal-art.pl/uploads/userfiles/files/27104263570.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/540oqjetqk7ne1tggrnh9786pg/vokim.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/laraxurowowunugamuruxevir.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/21121062346.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/74159520980.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fuvozudewemelafa.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/85430281767.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/43852233622.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/65557732560.pdfIn PDF document text
    • https://blv.by/upload/editor/files/loxaborupodatinojuja.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_AAA3B79601EE5019.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d10805ee90---wosapin.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/93932465140.pdfIn PDF document text
    • https://ntc-container.com/upload/files/91807808563.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/fagelujesemabedevedexub.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210905_9748C2AE266690CC.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42608714885.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/23966585702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=un+cuento+triste+no+tan+triste+pdf+completoPDF 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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 16704 bytes
SHA-256: 03a67e75234bc3f386c48f9160da04f7df7b196d986d493e0882d60478de20db
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10888 bytes
SHA-256: 351dcc8ec93eb7d6a0c2b16d6d8b95eb3bf12b27b8cdf68281c84d273879deef

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