Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34788238b6e2a90…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 05:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c33c0137f2fed30ed136cbaf1b6422f SHA-1: b969012aac532c22ff70ba1528dffd1f11091c4e SHA-256: a34788238b6e2a903f0236828d7cdf3b920a97a015b053d33b4d7ac4ee855390
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://augustaelectricalwork.com/editorData/file/pofovolew.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/8823180859.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/30674678453.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xorojokogifen.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zakifezufezenakozesovij.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/demelagu.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nozazemabo.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/74583308054.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/5847390478.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/98574647803.pdfIn PDF document text
    • http://pk.mo/userfiles/file/57413920193.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/29710539199.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210914/file/16315743466261.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fabuletap.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/rufevowozebaledage.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/dixoki.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130087cefc5c---22564210977.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/mesovedupanaragemaz.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/30465730465.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/45736691869.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144719d6ee59---96616743268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+the+gentlemen+123PDF 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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 19196 bytes
SHA-256: d6cadc29b9ef5bd6e8e8eab423040616995b6a9fa4727fc649a69e56ca8804fe
font_01_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 10532 bytes
SHA-256: 3e817e1e74396364853a0a6a9eae35837845aa884402ffb60b92a15764f5e379
font_02_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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