Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd67b3b410d93eff…

MALICIOUS

PDF

95.6 KB Created: 2021-10-16 11:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 48bde917f0265f61e9ffabb5b9b7f284 SHA-1: e67ebf952a90e924682836e41e248465eefb3f2c SHA-256: bd67b3b410d93eff4a6ee066735e75d8c39cb0fadf22a50f7052592f0af31b79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to disposable domains, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.pethouse.es/ckfinder/userfiles/files/ruvazawoposagogevala.pdf In PDF document text
    • http://factorycontrolprojects.com/userfiles/file/411126053.pdfIn PDF document text
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/debamedizazelanunivawir.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/97425933682.pdfIn PDF document text
    • http://exim5.hu/_user/file/2121374547.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d029ecd21a---86741183780.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/20921852223.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/lepigu.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/mezorawijaduxikeri.pdfIn PDF document text
    • http://tochuchoinghi.org/files/vuzudovezezupebadu.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/xikegolelumanibev.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/xagawedaginomuserisepepig.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/2030323761.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/40191261347.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f3b7c683b3---69101383159.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/jonuwo.pdfIn PDF document text
    • http://devison-matras.com/upload/file/zosukaniji.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/xirazavupidote.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/9259984645.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zotopufonig.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/pexonofavu.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/kizetubiradiwuzixeguju.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79210745961.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=game+of+thrones+season+8+episode+3+online+freePDF 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_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 19152 bytes
SHA-256: fb14619431f6b70ca1ee943d7be5bb20bcdc6982b0dfdd39d3a1748eb47cf2eb
font_02_sfnt_off0001567f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567F 11180 bytes
SHA-256: bb9e9e0d27a4938c3b133b087e26297d3e3316b67bd04a8fcebe9b3b5723e1d9