Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d5dc235578b9f…

MALICIOUS

PDF

155.8 KB Created: 2021-09-23 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f6a123ded1fe4ed02c450aafacc02dd SHA-1: a4e8925d83286155b36d668fe70d3ab799d00a47 SHA-256: b36d5dc235578b9fc56cebec1a719acf7793e5d4b4a491a6d8f7b283e6f39c9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://ccskin.com/geektic/files/mepimolujasafitez.pdf In PDF document text
    • http://herve-coiffure.ci/files/wumesoxuxufedivawob.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae623e903---625885271.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71952089460.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xidikos.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/18481264439.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/gadiludidozisisibiwolu.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/14043124716.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916025907.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/12798186102.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/desofojemirakadomamada.pdfIn PDF document text
    • https://majubesar.org/contents/files/72575737418.pdfIn PDF document text
    • http://reopen911.info/media/file/lizapelofegurisuge.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/roxerato.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/95030523929.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25112331569.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/raratepajiv.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/17601698962.pdfIn PDF document text
    • http://ktcz.eu/files/files/12824088384.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/46799666829.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/45825737781.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/75176454788.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/6499119184.pdfIn PDF document text
    • http://esipro.be/userfiles/file/wipixazuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=linda+goodman+star+signs+pdfPDF 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_off00020211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20211 18140 bytes
SHA-256: 9d68d3e8b61eec95211681fb19f625f5f4548cf237e3a3f1b1759eb402b59073
font_01_sfnt_off000230ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24903 10620 bytes
SHA-256: 8b034383e2e35691bdb6e60cce9fb617e72a44e1b1ddc9e3c3016d09327356b4

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