Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dad9a2300105fd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 21:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a905bd6c2914b44759a8952d35171b37 SHA-1: a0fa2195402180b5209ce8dccdf627e9e2279c6a SHA-256: 81dad9a2300105fd84fc648d554cd3e4686a7f6df090bbf76d689a04808c37bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a common technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://autoscuolecasetta.it/userfiles/files/xejavakukuxada.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/82689840304.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/juzenonokumiw.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/60255983242.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/22770376616.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/38434526824.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/noder.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff80998ee---21408373456.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/bemufukifekudef.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/57591049379.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/wederikuro.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/tidevakafajuvabozez.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/35cc178c40ec5b2eddc8b580fcfd3537/47674943049.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/83593932528.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/21226876878.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/64713115675.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/30994997493.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/92594678422.pdfIn PDF document text
    • http://cabini.it/userfiles/files/80300491030.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/4101817859.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/80073046702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=angry+birds+space+game+downloadPDF 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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 14996 bytes
SHA-256: 6a110fcd719ed7d0bf2abe81d6d644bc5f4ed79fe38ae1bc5c725bd7c9f70a94
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 11080 bytes
SHA-256: 079545c3ca4144065c933969f0147b02d9f5bd6611674683fed9b54ac6b2cfff

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