Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a4383d02886a95…

MALICIOUS

PDF

40.3 KB Created: 2020-06-20 15:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df7bfd30fb246de7d85c12d24f131db6 SHA-1: 7cc8faf1913c4f14b89613d95b7a63cf98f3d8ee SHA-256: a6a4383d02886a95721496276f6528d7c80bc025dd7dab99692dc9fc3e2c49e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The document body contains several URLs which are likely used to redirect the user to malicious content or phishing pages. No scripts were extracted from this sample.

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://4pwcrv.bdgct.com/uploads/1/3/0/8/130813466/130813466.html#quran+in+hindi+pdf
    • http://pomawanian.com/uploads/1/3/0/7/130775762/8982876.pdf
    • http://mealsthatmatter.ca/uploads/1/3/1/8/131859613/zewegur.pdf
    • http://beaumonttennisacademy.com/uploads/1/3/1/4/131454345/vewovegubufasap_sexadulinaduxaw_kujosokoka.pdf
    • http://trantafilphotography.com/uploads/1/3/0/8/130874120/xibonejugodabo.pdf
    • http://mx.rtscenic.co.uk/uploads/1/3/1/0/131069935/lokozusajasomugi.pdf
    • http://lanotarynearme.com/uploads/1/3/0/8/130874521/817e78.pdf
    • http://cockspa.com/uploads/1/3/0/4/130476144/1005217.pdf
    • http://darkskyislands.net/uploads/1/3/0/6/130604821/4a02008f29b0.pdf
    • http://clashingmonkey.com/uploads/1/3/1/4/131438587/somapawisi_ferexoneb_monerarogigodej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045b8.bin
cb9f789d5c817e10ab23ec1f8af07d66a7c40c6ee531a36f00e728d9770e5a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45B8 4556 bytes
font_01_sfnt_off00005510.bin
3807945eb1322f8ba8dbad43f0db47afe4d9206348bdf82818d7c6413ee27632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5510 10512 bytes
font_02_sfnt_off000078ff.bin
43ad1194dd96f2ac65d6e7ed9f1626c384006a67f9640edb54c61a3e9451fa82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FF 8152 bytes

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