Malicious PDF — malware analysis report

Static analysis result for SHA-256 86df8c2a1f6e6c12…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3516c523b1cb1b1c8d24255f87f2e7d SHA-1: 5ecdc71e516c9835a24bf3135b9d8b20b82cb080 SHA-256: 86df8c2a1f6e6c12a69ed59e5c0117f930d40f35c069b9c5c2bb94569d87ee78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://aqs-group.it/userfiles/files/73527867378.pdf In PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xavitexapovarotere.pdfIn PDF document text
    • http://nessium.net/userfiles/file/najomalife.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa43335e56---87731633311.pdfPDF link annotation
    • http://nyitotthaz.hu/userfiles/files/99385768585.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/pipasuzikimat.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/fofinuv.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/12945949045.pdfIn PDF document text
    • http://recrute.fr/files/files/xadel.pdfIn PDF document text
    • https://theurbanthinktank.com/files/72106181945.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f1f6267513196cb20c821d7f80852b18/gegefubegagi.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/27131973920.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/74408013832.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/bojibemazon.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/64327975638.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140642d6cb54---76737227777.pdfIn PDF document text
    • https://pisausakti.com/contents/files/64486688249.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210908180631.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xuwob.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gopiwopusom.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/54678869703.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/sonebokosinipusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+clear+data+on+firestickPDF 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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 10636 bytes
SHA-256: 758b13cbc95ec86952e11bcf2a327bf5ff6c67d82acbd2c4032eb7d0eb7d637f
font_02_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 17088 bytes
SHA-256: 6cdcd28fa0569e19b67a074f56f4b50d11a6265c76e5320437864ebeccf62c9d