Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e66bca7bed5ad4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 00:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7eb3ef6fd135aafd16efe65f8e75932 SHA-1: 56917c6448b2983d2f0c9968e3aac38782272e9d SHA-256: f8e66bca7bed5ad4ba01546ce4232e9b8b82d92d501676f9c1da309387a808bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://baovecongtruong.com/upload/files/sowavo.pdf In PDF document text
    • http://mondoacquapiscine.com/userfiles/files/lizojo.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/94271152200.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/tunufobadutipeliven.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/ramifubedumuxetijiza.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/86490639722.pdfIn PDF document text
    • https://mkontroll.hu/File/livixegaxekabiboki.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/bbfeef6038f0b139c4f8602e933a0f34/feviravuterokak.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/74487897449.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/79388610630.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/95339798927.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/gojatudodesisewabawi.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/88785337595.pdfIn PDF document text
    • https://bak.vn/upload/files/14964952133.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/97447196498.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bilelokivibakawo.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210905062952.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/98400531174.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/pexajakofuxodugut.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/8402077322.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/wegitulu.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sudidedafepemi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a297ec227---viparepagireruwesire.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/823497647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pubg+game+new+update+2021PDF 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_off0000bca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10828 bytes
SHA-256: 72de3bae5cc1fa2d04c7d01693444cd04594c91d2973807e0c0c747ae85645a4
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16608 bytes
SHA-256: 898205104d1d02d671dfde473aea477b2b36ed3accdd67cd67815837ab1d3e5a

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