Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e21a82ff973f462…

MALICIOUS

PDF

73.1 KB Created: 2021-02-19 05:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 79faf4b4298ef1a08a1dba50443919dd SHA-1: 1027fe03495dbb70254850b53ee3c821d3edd09d SHA-256: 6e21a82ff973f462affff78299f111d0166b55e0b51a16cc539e3808fd550ffe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that appears to be a lure. The presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://baarspo.ru/123?utm_term=why+is+philippine+literature+important PDF link annotation
    • https://sanakifagijegu.weebly.com/uploads/1/3/4/4/134404207/gefasete.pdfIn PDF document text
    • http://vienvozvrat.site/3359719999v9how.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/iigdeC5/word_search_maker_software_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/4hbnEhh/amazing_wallpapers_for_laptop_free_download.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/30a7b9186f5a90e.pdfIn PDF document text
    • http://runolive.com/cracking_the_coding_interview_6th_edcwbgd.pdfIn PDF document text
    • http://forpost-electrica.ru/free_cookbook_template_microsoft_worddmx38.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/dopedejezugod.pdfIn PDF document text
    • http://belkwigs.com/25667647672fw2gd.pdfIn PDF document text
    • http://getsalle.xyz/tamil_new_movies_freev3o0s.pdfIn PDF document text
    • http://mattelipsticks.site/wilijeti5r1j6.pdfIn PDF document text
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/zegodigemev.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/d7197.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/vupen.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/dvjimie/texas_a_m_maroon_paint_color_code.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/AOliaYE/56902905455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fedd484e13c0.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/693754.pdfIn PDF document text
    • http://1pokypki.website/work_abroad_guide6zcom.pdfIn PDF document text
    • https://tagufonatudivar.weebly.com/uploads/1/3/4/6/134609106/vuwopogarodenifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5176 bytes
SHA-256: edc3ba1dc59be6e644e7894093119baf60e9535442fa2ddccf6e2b045d29587e
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10668 bytes
SHA-256: 32212b61cfc80a9a16a5e5c58f26dd6744cf18014dd6f5d54f730932c985ac65

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