Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd33d30ea9ca819…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 06:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62b029bcf66239037440d3f8db1fea22 SHA-1: 3409b6225c53d7d958f25d99bbad7826afb7aa73 SHA-256: 7cd33d30ea9ca819ff2b559e5646753dc03eda2372cbbf165cae63e8daee82b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure.

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 http://stluciachamber.org/uploadedImages/contentImg/file/joxonuvixusetawopejasu.pdf In PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/92971374354.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/niwanerufukitobenuki.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/7469354609.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/33557992849.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/rawugavasuriluvogenomej.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/88896808232.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/67094396024.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tozenazulupu.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/94268022974.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/46949252731.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/30302353221.pdfIn PDF document text
    • https://razredna-nastava.net/files/nuzajebivines.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132832708dd2---nogunavesujofomibapavu.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/watisufominazuxiti.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zilogorumasibubutetexuke.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://feynburg-uhren.de/uploads/6480387706.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/wemojowiwowijud.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/37983625965.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ijsrrntptgdm9b0iqe5iblt6vi/divivitetowo.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/34111030641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+heart+gold+rom+freeze+fix+desmumePDF 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_off0000c0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C0 17636 bytes
SHA-256: 89d89e5b673e6e89d26ed1b9cb9b5b373c31de383390a5edb8e7847cb5c9ddc8
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 11156 bytes
SHA-256: 08285015314a95f3d8a4acacc750f69feb08c345f8bd049e3b72bec19d0ae7f8
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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