Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1547528c908f22b…

MALICIOUS

PDF

59.6 KB Created: 2021-03-16 19:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c08b2f48ac7192826b384b97d4ee8269 SHA-1: 0dea3ef74d493f071c5c1e56213959f8343c0c2b SHA-256: e1547528c908f22b3a06910e8b07ae1a7f4bac00827733d9cf5e602f5867609c
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but does not provide direct instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9570

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://druttle.ru/award?keyword=dieta+dr+atkins+livro+pdf PDF link annotation
    • http://copyright-securityx.com/android_screenshot_app_apkaekpj.pdfIn PDF document text
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/sedajegi_madiresogose.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/867c6609.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/eOeichi/dewalt_electric_hammer_drill_bits.pdfIn PDF document text
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/zopajako.pdfIn PDF document text
    • http://digitalmicroteter.xyz/recon-_ng_tutorialwmuk9.pdfIn PDF document text
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/larajomuxox.pdfIn PDF document text
    • https://fodoradesak.weebly.com/uploads/1/3/1/4/131454556/5245263.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/b54fb25c5f9344b.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/sakujuvigipagogupulo.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/jukux.pdfIn PDF document text
    • http://fruct.space/dugakemeviguximibozume9c1qu.pdfIn PDF document text
    • https://cdn.sqhk.co/remirokus/ojgjds0/short_film_ideas_for_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a00291-4e91-4e22-bf66-a26be0932a85/wibonipozokegoxikes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c29f43-2681-4abd-a01e-d0e806e8cdb1/dajopavozusazenab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ef4bb8-82a2-43b8-b007-61611edfaed7/84709313319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70769f3e-5586-4d18-92c6-fbb74256a455/temiguneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b54b431-913f-4fbe-a43c-e8e2c2830ad7/what_is_correlation_of_rock_layers.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 5156 bytes
SHA-256: 315e97a56e546adfc9f66ac466aa560c34b707fd2349127373c6365b0a44b626

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