Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b5ec7e6e574dc8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 05:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f74a802f929c2653caf5273a8ae91cd3 SHA-1: 97af7830e9306907874384ef816aa7629f96eeb7 SHA-256: 29b5ec7e6e574dc87267d902eaf077806dbf7d534ad30a261df9c7a7eb00fbb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://felicitareonline.ro/ckfinder/userfiles/files/13595257714.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396de66264---81184568823.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/32382148780.pdf
    • http://khautrangkhangviet.com/upload/img/files/xikerasuxe.pdf
    • http://wawabed.pl/uploads/userfiles/file/30718927765.pdf
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gezosukimi.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/vuzelubavabebegomomakipe.pdf
    • http://mynigaoe.com/upload/file/20210908142402.pdf
    • https://pensiuneaselina.ro/userfiles/file/95528096930.pdf
    • http://rhondachem.com/d/files/zaref.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133e950bbee9---98488870038.pdf
    • http://daiichihr.com/uploads/news_file/45777973254.pdf
    • https://rafaela-motores.com/userfiles/file/ladumanifekafeju.pdf
    • http://att-na.com/upload/mazido.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/95081165995.pdf
    • http://getdol.com/page_data/file/1362430833.pdf
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdf
    • http://liburnia.pl/userfiles/file/78600534258.pdf
    • http://commandhousecreations.com/uploads/files/42251738544.pdf
    • https://hoakhanh.vn/uploads/image/files/84448768543.pdf
    • http://standardamulet.com/files/files/kutexutajokiwirali.pdf
    • http://evaemlak.com/userfiles/file///nezaje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wav+to+mp4+convert
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF0 16792 bytes
font_01_sfnt_off0000d502.bin
865b0472e6e73343045fc39265b8da77ed1faaad029e8185967942b4cebc6deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16880 bytes
font_02_sfnt_off000100ce.bin
43ae0d88e734ee330502c8e0298fcd687120ced42a3c481d993abd878de9be6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10368 bytes

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