Malicious PDF — malware analysis report

Static analysis result for SHA-256 e771bc924e471881…

MALICIOUS

PDF

41.1 KB Created: 2020-11-06 19:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9a4a971da3dc039924890890f0c98cd7 SHA-1: 1d057c1dc1e1a2341f720c4a347ae8b347d8dc52 SHA-256: e771bc924e471881f65df6b0f7260ea28f52b5fbcb1796c54e3d5b5256df6116
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffi.ru/aws?keyword=sickle+cell+pedigree+chart', which likely serves as a lure. Another URL, 'https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/3939243.pdf', is also highlighted by a heuristic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://trafffi.ru/aws?keyword=sickle+cell+pedigree+chart PDF link annotation
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/3939243.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/depopetuvubimudej.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/wonoti/93174969203.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd54d29c-8601-4f19-82d3-851773cb5881/2735805079.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/79535058756.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/is_mcleaks_safe_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ca7ea2-bdc4-4542-8206-9b7664a7f14f/51753948209.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/blogspot_de_libros_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pajerebowifi.pdfIn PDF document text
    • https://fuzivezabezi.files.wordpress.com/2020/11/togin.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_off00006358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6358 5324 bytes
SHA-256: 4bd625c02beb7a3d18d5f7833ba7520ca6e8cce253b56ba7f99b6ba85b7a8a2f
font_01_sfnt_off00007571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 10192 bytes
SHA-256: 028a18170c756faf283e481b17b5acf43c708d8de7ad7b26a22716abc3838b7b