Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e68d5bfdddd7014…

MALICIOUS

PDF

38.0 KB Created: 2020-05-31 22:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd013e84060d7dbedcc5d6ee7c32e22 SHA-1: 8b9e66408d880f75e988e0acfa41bc111e509403 SHA-256: 0e68d5bfdddd70143b8687f14b52bb5418425c9ea5da63d8355f81d8d3ddc16e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to WordPress hosted PDFs, which is indicative of a link farm or SEO spamming technique. One of the embedded URLs, http://host17.carmichaelnl.com/uploads/1/3/1/3/131380469/131380469.html#conclusi%25C3%25B3n+sobre+los+valores, is flagged as suspicious. The ML classifier also strongly indicated maliciousness.

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://host17.carmichaelnl.com/uploads/1/3/1/3/131380469/131380469.html#conclusi%25C3%25B3n+sobre+los+valores
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rovizemafogi.files.wordpress.com/2020/05/meniga.pdf
    • https://tazasituno.files.wordpress.com/2020/05/23193917656.pdf
    • https://zimixukegor.files.wordpress.com/2020/05/47332877152.pdf
    • https://zimixukegor.files.wordpress.com/2020/05/sanokijegimunexavitufu.pdf
    • https://zezumova.files.wordpress.com/2020/05/datukubezureselepixefowi.pdf
    • https://majemim.files.wordpress.com/2020/05/nefujurijagumiwipemivav.pdf
    • https://timowasufu57836677.files.wordpress.com/2020/05/91817877545.pdf
    • https://panuvezipib.files.wordpress.com/2020/05/48550900676.pdf
    • https://wopigumu.files.wordpress.com/2020/05/gujajanajosaredu.pdf
    • https://ribekewozepu.files.wordpress.com/2020/05/litirugerirajej.pdf
    • https://sizatasuxam.files.wordpress.com/2020/05/85489514817.pdf
    • https://zitipon.files.wordpress.com/2020/05/gasesokoxoxurufu.pdf
    • https://vogojogixizi.files.wordpress.com/2020/05/limode.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_off0000638f.bin
35090733beb6a2203dd78ff5bc10cab94d2703a614b1cc3660b5049f631cc687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638F 12288 bytes

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