Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b56b60fe13217b…

MALICIOUS

PDF

98.8 KB Created: 2021-09-14 05:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46869f18893e804f0b2fe43c5a01ee19 SHA-1: 567a8ee53acb9998b33f721237faaecd49e6a36a SHA-256: b3b56b60fe13217bb00131fd7f9a19d9c5243750190d5f789415b42507d04692
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://pasted-radio.de/web/files/19626727678.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/23261099040.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/70390186517.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/89446947100.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/80321232590.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/9539501698.pdfIn PDF document text
    • http://eva.am/files/1d84fc7185492e73.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/resezususifegan.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613078e64ecab---suturapukasizagijenozolel.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/40994589201.pdfIn PDF document text
    • http://accronline.com/userfiles/file/68722483165.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/wolumax.pdfIn PDF document text
    • https://mackbeks.com/files/file/89190633858.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/34637238835.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/sowonuxumexogogekefamex.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/82537953878.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/68546180920.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/fopitibimafenirekab.pdfIn PDF document text
    • http://hidropro.hu/upload/96168404266.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/nopozukasowevereganotepux.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/85433088146.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/99579101915.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/78215178123.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kaduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=9+songs+full+movie+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_01_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 17800 bytes
SHA-256: dccec6f69d77dd315c703ce3f65a01aa900cca68d9a780d5895cd8b660b62d8d
font_02_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 10436 bytes
SHA-256: ebba959f4cb4809cbebcac32248d411280a98841a6035746b6e499b63fd23f2b
font_03_sfnt_off00016512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1