Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4fcb0f5da8696f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 05:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc9a286741abd1eacca34194260e7081 SHA-1: 208a959bd996ac1195e76075a6746c9feff815f2 SHA-256: 7d4fcb0f5da8696f4b7e247be1144d0b989dbc794276f0e3d988d4862dc534f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded, suggesting an attempt to redirect users to potentially malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://svarovani-tig.cz/userfiles/file/50691885948.pdf In PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210902_647094A9A7755FC4.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/85910182585.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/45440333642.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/jeluxikizuxowafawanaz.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/xabuvojob.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/12082510837.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/69572727171.pdfIn PDF document text
    • https://loctra.net/userfiles/file/38367914387.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3klg2dpl60cqgl08a42rrf88en/13605019612.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/68204358718.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/72811986314.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/99625795344.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/84478639390.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/43594574535.pdfIn PDF document text
    • http://dakov.hu/_user/file/majijol.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/73652625320.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roxixugowemibolevife.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/16609765253.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/jabapixeni.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/waxazufawinusop.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xufijipudefokolebowuwu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/57069194920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=strip+poker+android+appPDF 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_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10336 bytes
SHA-256: e3bbc4990a1bfa693943fc85aa7188fea45d0d87cbed5d507627ab83e4815fe2
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 18148 bytes
SHA-256: c1307db0daa48609e84a2acc181501f5d00b5652b07cd04937ec83f5082b6966

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