Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ca5904963355b4…

MALICIOUS

PDF

67.6 KB Created: 2020-11-20 19:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bf1d2047a8fcf4217c2f2189c01e016b SHA-1: b77b3f097a014f2fc7eb4d39e781e7213143cb82 SHA-256: c8ca5904963355b488898e1701681062883d6541c57dae6305f7e44490bad414
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to domains associated with link farms or potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content-scraping attack pattern.

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 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://traffnew.ru/123?utm_term=subtraction+with+regrouping+worksheets+pdf+grade+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8daea77a5e8.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/xurubomal-xuxiv-wexelifela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5f9a0e3a3d95a.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/natap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5f9896a9edfe2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/mixomemobidepizopiwarel.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/devi_atharvashirsha_sanskrit.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/romeo_fairy_tail.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/backstreet_boys_black_and_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/xapiripeleba.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/juwolupigibovevitikik.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_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 5948 bytes
SHA-256: f9d28a5ff5a269e163196bb0bc1a7e0df1de06622397df2ccd3b0ee9b2457b92
font_01_sfnt_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10568 bytes
SHA-256: 88814b360d9e91294cad635cc563d69c1040a30111cb5dfe0b1b38fa8c01461c

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