Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33e66f3e275575…

MALICIOUS

PDF

42.9 KB Created: 2020-06-02 13:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd4a98447678e7f84e8fcee4e9dd3b3f SHA-1: 006ed400683f5a12c3d735f192f77b53675e2ceb SHA-256: bf33e66f3e27557567c4c02d31b14a0d225c49fed7fe17f2578aeacf9602e097
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to '7 days to die anpflanzen' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document designed to drive traffic to these linked sites.

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 http://costasol.shop/uploads/1/3/1/4/131454029/131454029.html#7+days+to+die+anpflanzen
    • http://cielet.org/uploads/1/3/0/3/130313346/bovibaduvol.pdf
    • http://renthousesokc.com/uploads/1/3/0/8/130813953/ranaleki_wanori_kogesa.pdf
    • http://evashnaidenart.com/uploads/1/3/0/8/130814591/babuwimomuxupo.pdf
    • http://kcwesley.org/uploads/1/3/0/5/130551491/92ef4e97168af.pdf
    • http://professionalresultsorganizing.com/uploads/1/3/0/5/130551429/2d4125e204eaf.pdf
    • http://afkas.online/uploads/1/3/1/3/131381052/binupebejerutape.pdf
    • http://mail.dulvy.com/uploads/1/3/0/9/130969281/0255f.pdf
    • http://africaneagle.org/uploads/1/3/1/3/131383319/8553525.pdf
    • http://toriadavis.com/uploads/1/3/0/4/130483725/57d7e5777ba544.pdf
    • http://costasol.shop/uploads/1/3/1/4/131454029/terms.html
    • http://costasol.shop/uploads/1/3/1/4/131454029/dmca.html
    • http://costasol.shop/uploads/1/3/1/4/131454029/policy.html
    • https://vidizumofaxu.files.wordpress
    • https://vidizumofaxu.files.wordpress.com/2020/05/dutiw.pdf
    • https://gigepopigep.files.wordpress.com/2020/05/90971161251.pdf
    • https://tinugezova.files.wordpress.com/2020/05/jomuz.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000774c.bin
6ca304ca55e1271e9d4ba0f17f91a994b913fd0218ff6769e2b00cf53bd230a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774C 12456 bytes

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