Malicious PDF — malware analysis report

Static analysis result for SHA-256 1741880fe9ba8cfb…

MALICIOUS

PDF

30.9 KB Created: 2020-05-31 18:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac350a5bd4e1b4f7d4b05eb20ed44233 SHA-1: 9e3a1ff49e8bac4617cb31b424d0aad1e92b39d0 SHA-256: 1741880fe9ba8cfb4b5c28a1573db66795fb5362970dfed5cb746f04bd015ab2
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a website that appears to host a collection of other PDFs. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://the-wild-moon.com/uploads/1/3/0/4/130483114/130483114.html#introduction+to+analytics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bamisenu.files.wordpress.com/2020/05/resegi.pdf
    • https://muvowovu.files.wordpress.com/2020/05/29908281216.pdf
    • https://xodugunoku.files.wordpress.com/2020/05/sefaforo.pdf
    • https://misawizotepu.files.wordpress.com/2020/05/32975322841.pdf
    • https://vemupuki.files.wordpress.com/2020/05/44789189415.pdf
    • https://mavuwepezigi.files.wordpress.com/2020/05/vobejaxumiri.pdf
    • https://zapofebozapu.files.wordpress.com/2020/05/53124765368.pdf
    • https://fabizor.files.wordpress.com/2020/05/jewefiledupajadazenaf.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_off00005276.bin
9556a79170265db6009b044b97428f6670ff190a7ba233fec84909a4b26df3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5276 9040 bytes

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