Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a6759b95484190…

MALICIOUS

PDF

117.8 KB Created: 2021-02-18 08:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6be9222933585039f9dfe96e4adf788b SHA-1: 7d5fffa71fa95710bbe984696092be7923a7002b SHA-256: 00a6759b95484190fd300eeb12cb576fb165a24e8ae79b8d9116f530d0d6b0cc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious websites, possibly for further exploitation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jacksth.ru/strik?utm_term=taylor+series+theorem+proof PDF link annotation
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/517181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6016b2f7783ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_6027feff4bb1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_602730eda1da7.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/xetekuludakozitex.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/8059470056ixnlm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_601d05419c00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5ffe935384964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_6004b932044a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_601ef41d4e12d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_6017c313f4063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_6001c4477d90f.pdfIn PDF document text
    • http://soinjaga.ru/never_have_i_ever_cast_paxton_heightz5fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5febd1d33815f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C8 5192 bytes
SHA-256: 7f66e64af361ae034171403143377bf104472af58cde8285b50eb967bc7af998
font_01_sfnt_off0001774a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774A 19212 bytes
SHA-256: 10dbf8ff1f9eee2fbe7decf93960621ce3ef04c3e5f4b26ce9cdf35713c48fe8
font_02_sfnt_off0001b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2AA 16644 bytes
SHA-256: 39ced522464bbdbc1608f339ca3d8afaada9051a2c1b777c77a95c4412e1d802

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