Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf34f8b535d413de…

MALICIOUS

PDF

79.9 KB Created: 2021-03-11 22:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f9f723901191d808e28e86342b9d916 SHA-1: 5c4014224744848120a07551936efd1f697bec3e SHA-256: cf34f8b535d413dec7771fb0b8539f194c8eebbfa0c14ede49a798cee4966b54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to drive traffic to a network of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection or content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=acta+de+constituci%25C3%25B3n+del+proyecto+pdf
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/3068066.pdf
    • https://cdn-cms.f-static.net/uploads/4379491/normal_600f36149ff2b.pdf
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5ff0f6c7c9385.pdf
    • https://cdn.sqhk.co/nubenirosife/ggDogdJ/portage_mi_school_calendar_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5fe89bd7212e3.pdf
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/zofadow_nimalelir.pdf
    • https://cdn.sqhk.co/xovepejegosi/c7nvtLI/alexa_rank_checker_download.pdf
    • https://cdn.sqhk.co/guviterolovu/hcAhdli/basic_marketing_research_4th_edition.pdf
    • https://cdn.sqhk.co/gijesali/htihkhc/sago_mini_apartment_mod_apk.pdf
    • https://cdn.sqhk.co/wokowuvawuz/gfVjaMS/cops_n_robbers_mine_mini_game_mod_apk.pdf
    • https://cdn.sqhk.co/dejegekonula/bYSyQia/navudevujumi.pdf
    • https://cdn.sqhk.co/fugovigul/uicPifT/bofatekomadawile.pdf
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602290e196122.pdf
    • https://cdn-cms.f-static.net/uploads/4478968/normal_5fd86edd4934d.pdf
    • https://cdn.sqhk.co/mitukutowum/fiaghXD/40957477578.pdf
    • https://cdn-cms.f-static.net/uploads/4415929/normal_602e55f467ba7.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60322cad495bf.pdf
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/witaxudesafik.pdf
    • https://cdn.sqhk.co/fiseguvugele/iaibidh/fasuradigedeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin
69c9fcfa029de78cca25fffe1c6373458206bb4211d49d1e48b35cf9845d9815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5256 bytes
font_01_sfnt_off0000fdb1.bin
8383d655ed06b59ac2944ddf3fe0a8f9ed945c615fef933d4efd57a869e2e031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 11156 bytes
font_02_sfnt_off000121f3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 4324 bytes

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