Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebec578ebf4e1c3…

MALICIOUS

PDF

66.6 KB Created: 2021-01-06 15:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c79c803c473d266d8dfe8c6a192234d3 SHA-1: 47575a89c65da1ed1bc225a366c3c103e1a03ed0 SHA-256: 1ebec578ebf4e1c3fa4971e872e7e6c891734267a94d942a38647e896812b0ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The embedded URLs point to various PDF files hosted on external domains, likely serving as lures or further redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 4

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=occupational+safety+and+health+iti+book+pdf
    • https://cdn.sqhk.co/vujenibolo/ijZ4ijh/fairy_tail_high_school_never_ends.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fc31235ec8f1.pdf
    • https://cdn.sqhk.co/zexoribuj/hrXiaSl/zepapetadi.pdf
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5faa1c2221c78.pdf
    • https://lugulake.weebly.com/uploads/1/3/4/7/134763312/pazenubumewadog.pdf
    • https://cdn.sqhk.co/xufatirumina/S5x65mR/rotary_tool_kit_walmart.pdf
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/suvopusedikefiv.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/a6ecbf06788df.pdf
    • https://cdn.sqhk.co/dagizonu/9YMgjjj/22342620307.pdf
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/vilufakij.pdf
    • https://cdn.sqhk.co/fuwunikuneg/gjaRtia/tixupu.pdf
    • https://cdn.sqhk.co/gefimiwotux/KheVFgg/vosakonexijerokez.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/e005633ad6af2dd.pdf
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/31d235355f.pdf
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fdd75411735e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin
8af206c33fe3da5db94bcfccb3759b8a0c281fcd19e93840e2250dbafd505839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5480 bytes

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