Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82298763ef62bf7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 13:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cddf5a8619aab0bd6dac0060db2d8c1 SHA-1: 3cf10e50bf6bfce0d7cdd5823d3742bd7bd9275f SHA-256: f82298763ef62bf7f4e3927bded1a8ff4cb72f46b89d665ec477ba4346bb751d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm with numerous external URIs, many pointing to unknown or potentially malicious domains, suggesting an attempt to distribute further malware or conduct phishing. The presence of embedded JavaScript indicates a potential for executing malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xiwin.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/71018181994.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/fetavukesusa.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/turiso.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/64958396533.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071234371667.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/46414441769.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcc4bea83---77704648970.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/74392661322.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/xadepulikujobunosedot.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109062129271913.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/jizabowikofonuxefanosi.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/34416723737.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fumewejupowiwawox.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f95ec93d1---8617099329.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/72549315448.pdfIn PDF document text
    • https://tch.lu/files/files/27296809736.pdfIn PDF document text
    • https://masukpt1.com/contents/files/39182243364.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97588422065.pdfIn PDF document text
    • https://noddy.nu/images/file/65925918344.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/lutupisozed.pdfIn PDF document text
    • http://sql110.com/pic/8443528856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=narasimha+karumanchi+data+structures+in+java+pdfPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 11084 bytes
SHA-256: 1e1c0440b537598349698d99a689a931f310223442b8f82343894d8a957dde19
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 18680 bytes
SHA-256: 14ba74235e1192c3af383b3d57287d5c2aab58375d3f72643c76f5c7cdc2027e

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