Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c46170b796a723e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 16:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f8dead52fcf39271644a55e564660b4 SHA-1: 6c0dd37af14d72e04c3e54c0d3d4025cd51700c0 SHA-256: 6c46170b796a723ed9a8fd8ac1ce57e676f7ec98f4c3f0b7968a1d8c0448bc16
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.zaluziemalina.cz/userfiles/file/2388693688.pdf In PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/57486127916.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/pomamoforiz.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/78724289033.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/supov.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/jexolodebudajozonola.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/xemekokukivukawisoxividu.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/56478723463.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/abr8ne8soq2gl5oianokq24l24/matupufogujiwokowakowaf.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99389778358.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/23433379649.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gusavezem.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/texopofaxogibuj.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/ruboxok.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/26940954057.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/57560853112.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/26276199583.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/refiponilerilunilisekupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8d821928---36033993295.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/19451177381.pdfIn PDF document text
    • http://tiquital.com/documentos/file/45936850797.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/26010294278.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/11553293042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+elder+scrolls+blades+mod+apkPDF 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_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 17880 bytes
SHA-256: 896e52fd692fdcc805c2cb4f385900e7533ffac188555d8213b194749f955c66
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 10680 bytes
SHA-256: 72d204f1039725cff756c71eaa4c42f9145c5de6181b760565f8be63f51db8ea