Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dad23e68324d50c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 10:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c0d80dbe3127bac10fbbe81ebdad3f2 SHA-1: 2a37b6ee2f6e4988b779586391f8823551440984 SHA-256: 4dad23e68324d50cecb2e2f4d246fafabe6200e4606ac54465a7d0e0cd33199f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a link farm or redirection mechanism for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF viewers to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chiari-web.com/ckfinder/optimist/files/56255176065.pdf In PDF document text
    • https://handientu.vn/userfiles/file/947807105.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/guzebolito.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/dabubiwoxome.pdfIn PDF document text
    • http://gabortech.com/admin/file/64311577051.pdfIn PDF document text
    • https://0900107678.com/upload/file/xumalazasosaselefo.pdfIn PDF document text
    • http://www.ezmoving.com/file/buzoripuwi.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/3224086317.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nuvufejebasodoxap.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161369c70f3117---xawelagewopinate.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/9274709383.pdfIn PDF document text
    • http://www.og2c.com/images/file/26901529871.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210909140915.pdfIn PDF document text
    • http://muszempilla.com/files/file/47730186601.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/48641695833.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/26356160661.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374a54398ec---42804591543.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/95366833674.pdfIn PDF document text
    • http://okvin.org/userfiles/file/fefabevetirasuraku.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/85329976304.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/41954357071.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/julerirobos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+game+passPDF 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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 10304 bytes
SHA-256: 1a585af29b23adaa6b1459b1937394f5873f2bf54adc2451d27268dd8e2d7a34
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 17808 bytes
SHA-256: 242690192a027a994f28eb233372823a6938b1515536a1502d8de7a5b28651ca

Open this report in the interactive analyzer, or submit your own file for analysis.