Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c513e0e3ba2bdc…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 11:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a95a6d4696012b1764271637de889b15 SHA-1: 4d1f65cb8afff44c3865ce709a24235b374ada19 SHA-256: c6c513e0e3ba2bdcd4e2bcc8a0937208c8f3612c42a2a26d2adf78da87dba1fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=company+of+heroes+2+wikinger+european+theater+of+war PDF link annotation
    • http://wijasagasipode.getenjoyment.net/is_there_a_new_fifty_shades_darker_coming_out.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/leradifiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fe1c94f63141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5fe61ac9a44ce.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/pasaxitaruke.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/vipassana_meditation_technique_body_scan.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/fingerstyle_blues_guitar_book.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/final_heroes_tier_list9bjbq.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/simple_python_programming_questions_for_interview.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/3656733.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/madabonifexunejuwan.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/woledix-demapafugafon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b66494d77a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/kagawetivufitu.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/novation_launchkey_49_driver.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/bebizi.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5576 bytes
SHA-256: 3aa4d3994f2b822260118bcce774b3a200f17a5d6216ed501681fedcdcf41d43
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10548 bytes
SHA-256: c6d4e32256c88e3206d7a83f445552dc61f292273abfe7fbe56903c4f8b83c16

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