Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce63ab7ae1ad644…

MALICIOUS

PDF

35.1 KB Created: 2020-06-05 23:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7e7cd52c9ffe8c9de302037f36f492 SHA-1: 4902abd64888200567459cec6f219719a4663994 SHA-256: 8ce63ab7ae1ad64485c305cb3970f4ba176f6273fb2483e358299a539a283b71
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The document body, though partially corrupted, contains references to the URLs found in the PDF_URI and PDF_SEO_LINK_FARM heuristics, confirming the link farm nature of the document. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

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://abraxasroots.org/uploads/1/3/1/4/131453720/131453720.html#4+types+of+sentences+quiz+pdf
    • http://scalespace.net/uploads/1/3/0/6/130639574/wegojox.pdf
    • http://thelittleowlgallery.com/uploads/1/3/0/2/130288410/jivebom_linaw_mimubi.pdf
    • http://ciarancronin.ie/uploads/1/3/0/5/130589126/napiperowimi.pdf
    • http://thejunctionmandurah.com/uploads/1/3/1/8/131857390/fuwuw.pdf
    • http://3clogisticsllc.com/uploads/1/3/0/7/130740142/pimakemeninarusoja.pdf
    • http://hostmaster.stirlingguesthouse.co.uk/uploads/1/3/0/6/130621045/43fc3a576c35c.pdf
    • http://server.lauracathleen.com/uploads/1/3/0/7/130775645/9fce50ca2c749d0.pdf
    • http://abraxasroots.org/uploads/1/3/1/4/131453720/terms.html
    • http://abraxasroots.org/uploads/1/3/1/4/131453720/dmca.html
    • http://abraxasroots.org/uploads/1/3/1/4/131453720/policy.html
    • https://fedotuleror.files.wordpress.com/2020/06/1641651613.pdf
    • https://jorajeto.files.wordpress.com/2020/06/98320214175.pdf
    • https://bimirofi.files.wordpress.com/2020/06/baxivazilidobanezerazajof.pdf
    • https://jusuxifigig.files.wordpress.com/2020/06/4575487791.pdf
    • https://fevagop.files.wordpress.com/2020/06/28961301739.pdf
    • https://bifofidolo.files.wordpress.com/2020/06/46619577003.pdf
    • https://funererole.files.wordpress.com/2020/06/pepivutowezi.pdf
    • https://sigibob.files.wordpress.com/2020/06/88192230897.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_off00005bdf.bin
a71ebe15a230b6164fc24736cabed4002d101ec54de9968ce122a23ac32a0513
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 10928 bytes