Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01be4069bd721d2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-29 10:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89d2110d510a0f13884ab2125f1dd326 SHA-1: 743f7713fcb177d8d7b3c53f970878ced27f9307 SHA-256: f01be4069bd721d2a12d447ddb50ad5be88b020b6e05349ea84bdc4c3ee381a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=dua+for+protection+from+diseases PDF link annotation
    • http://allgeology.ru/ckfinder/userfiles/files/98418514541.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/ketidubarusenixabenaw.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/39974221613.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/32081104189.pdfIn PDF document text
    • http://pbpharm.com/upload/files/jabolowisowu.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/20967823201.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/nusipigugibewo.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/bejunuwutaxeme.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/89704611810.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/72805846192.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/96332430473.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/15604032311.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xulapojizapuvomifuzuxem.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/vurosukewiwigu.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/51944780148.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/buxovuzadixusafexodabu.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/61041701259.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/tivamisutotari.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/xoxetoneze.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/sexukewapexawawamu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/luzugi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877fbabf26---49689487954.pdfIn PDF document text
    • 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_off0000ba59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA59 19320 bytes
SHA-256: e38465d157b81063d43c69dbd98138a754ade006522e817308b7e6cda00d0fd4
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 10836 bytes
SHA-256: d2572728b4ec94caa9c1885e51535c36ab1d7b6d300bd069ec96542ef2dd13d6
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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