Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4af523e6d460d93…

MALICIOUS

PDF

73.4 KB Created: 2021-01-25 13:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 39a081c8c72c5d44a6583b99cf6f473b SHA-1: 3e19cd288efd99722020360b8fd3e58b5efa836b SHA-256: e4af523e6d460d93fdf82c0eabf2d26db72f7cf7d1a5bed0f07ce36c67f5b056
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the PDF structure point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://trafffi.ru/123?utm_term=radicals+and+visionaries+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wezopexa/djiiehg/42240176542.pdfIn PDF document text
    • http://pusaburuku.22web.org/allstate_accident_insurance_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/N7hg6Ub/eastern_iowa_gazette_obits.pdfIn PDF document text
    • https://cdn.sqhk.co/vovidonob/dTidDOR/nova_launcher_setup_backup_file_download.pdfIn PDF document text
    • https://pagukusiko.weebly.com/uploads/1/3/4/6/134631218/46a1f7280b0ac84.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/jgfiggd/buruneki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxawaten.epizy.com/23589532972.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/33659849983.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/poxirapeganilisif.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/54062468931.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/52095786614.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/bezukadumekanuwekule.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/87853461186.pdfIn PDF document text
    • http://wujasulo.epizy.com/15430737519.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bidokurijudevoli.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/bhojpuri_video_dj_song_3gp.pdfIn PDF document text
    • http://gowegonuma.epizy.com/nipasumanefexomili.pdfIn PDF document text
    • http://zopefunexot.epizy.com/97560782428.pdfIn PDF document text
    • http://talagolow.rf.gd/leave_application_format_for_teacher_to_principal.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 5308 bytes
SHA-256: 8e8b973a9969f247bc0047825a5f25e7e4950a9703ecb8fc4df90d1127251f68
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 10988 bytes
SHA-256: 68f812ced88808d670f38799c0c430b5513ef07d45d01503e2b9f27b9316d863

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