Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da8538851d70fe5…

MALICIOUS

PDF

31.4 KB Created: 2020-06-08 22:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff676c237d1dbe31e855bac8c5771009 SHA-1: 258701283da0918b85a7b47a6728efd519241022 SHA-256: 0da8538851d70fe563e901fc81f8247649a6a007af1befd2354996f829cc47ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links to external websites, many of which are structured as a link farm. The document body, though partially obfuscated, also contains URLs that are likely intended to direct the user to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://nsylmc.brdge.org/uploads/1/3/0/4/130478295/130478295.html#anticorps+anti+nucl%25C3%25A9aire+positif+mou
    • http://houtworm-bestrijding.net/uploads/1/3/0/3/130323754/9a80575e1da3.pdf
    • http://plussizeweddingdressesinnh.com/uploads/1/3/0/2/130289741/5442563.pdf
    • http://hostmaster.blackhorsestables.lt/uploads/1/3/0/8/130813478/kevamepudakodadaso.pdf
    • http://protectamericasborders.com/uploads/1/3/0/3/130323130/mejepulan-nizinomemak.pdf
    • http://xserve.tuckercastleberry.com/uploads/1/3/0/6/130640223/rinetaseru.pdf
    • http://webmail.tempsineath.madesimplydev.com/uploads/1/3/1/4/131453993/jifodoz.pdf
    • http://arnhembijles.nl/uploads/1/3/1/1/131163864/4e887cf9841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rafuzakaxoru.files.wordpress.com/2020/06/kusubodelafavobe.pdf
    • https://zuzelerebola.files.wordpress.com/2020/06/vowobola.pdf
    • https://sokorirakuzi.files.wordpress.com/2020/06/26591540990.pdf
    • https://xipewatataz458399044.files.wordpress.com/2020/06/jiribosadubu.pdf
    • https://virolerimepe.files.wordpress.com/2020/06/36356666145.pdf
    • https://kuperira.files.wordpress.com/2020/06/33264033944.pdf
    • https://gabixuke.files.wordpress.com/2020/06/15885912301.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e92.bin
b8b4eac4677281187f759e11bc285e2a39982b32b4c04064e0f26502fc6979e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E92 10376 bytes

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