Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac458d832e322d2…

MALICIOUS

PDF

66.4 KB Created: 2021-06-05 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23bc59bfacda595510e9b6ef287017bd SHA-1: 952a9cfa09627e53656c7758918cd45a6520a9fd SHA-256: 6ac458d832e322d285ce9c6a4ee16edbfbcaebeade4e31e2b9361aaae12a7128
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9032

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 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
  • 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://pixomot.ru/pbw?utm_term=the+whipping+boy+quiz+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470218/normal_600f9c37d1c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5fed135a537ba.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/savidixe.pdfIn PDF document text
    • https://sifovepemu.weebly.com/uploads/1/3/4/3/134373157/ferew.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/3790383.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478125/normal_60b2825b415ab.pdfIn PDF document text
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/padofovezuwog.pdfIn PDF document text
    • https://zarogamotelim.weebly.com/uploads/1/3/4/3/134344532/8998498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446378/normal_6038ef927d844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_603ba0572dbb1.pdfIn PDF document text
    • https://fenixezefabiwi.weebly.com/uploads/1/3/4/3/134315005/b62b70078c.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/fb120caa078.pdfIn PDF document text
    • https://givurarole.weebly.com/uploads/1/3/4/5/134578012/052b5e01da710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6041c042142cf.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/tubesar_biwiwixatafarik_pinarame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_604334cfe2514.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/deeb932ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602019848124c.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/7866657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5248 bytes
SHA-256: 0647f573cb07775faa5879fbb245956be6382dd136ec31788bb9e23bae795a00
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 11536 bytes
SHA-256: 902cbf873c7819deb8f897a1678524b3c6b0e887289cb2f0fc99214e6ca848fe

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