Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a842dd02d5f4b8e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 15:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f45e9fd53158f0ba331b187f0599ec47 SHA-1: 5b3ac3170ae1390d13072db108948b5cf36a5b4e SHA-256: 6a842dd02d5f4b8e08509f4dddf21eecf40802fc2baaa730f0458b55722ed7c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/80510119458.pdf In PDF document text
    • http://www.vinoplaza.nl/img/upload/files/87562804932.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zuketisebisad.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/1608067521.pdfIn PDF document text
    • http://zuche0551.com/upload/file/49030540396.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/50654475117.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/fufer.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/fonesirapevew.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/17820674503.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/laterageloworuneto.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jijaradotez.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cf73edb6c46827ef6305a002c074bf50/31993686537.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/40528166088.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872967931---mevofuviwujadev.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021917051175297.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/20737350866142ffb5c3f26.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/lefibinefulalodela.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/naxukemogeviju.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vegevidaledifi.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55498198160.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/pakamavosufotugu.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/33765559030.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/87645272660.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/gogumubajewutoxiguna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+broken+screen+data+recoveryPDF 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_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 10708 bytes
SHA-256: 55a724be961689baaa7dc039c702445358cd81f0be248c2beea2a6eb7c5f4147
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 17916 bytes
SHA-256: a360213816ddb7236ecfc7dad0c6b22c4c5eb9789e052bf0d968b14079058318