Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec99bb550fe7480d…

MALICIOUS

PDF

39.3 KB Created: 2020-03-30 21:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec30a0cebc614e1f3bef663cab60f2c2 SHA-1: e63e1a905c578356e7d85bf63d0a688cbbd2ecec SHA-256: ec99bb550fe7480dd0a6c9a348e0697f26cfe34295402ac6ebb0a077934acb9f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting a coordinated effort to redirect users to a link farm. No scripts were extracted from this sample.

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://cookandsmithliteracy.com/uploads/1/3/0/2/130271019/130271019.html#nif+b-10+efectos+de+la+inflacion+cinif
    • http://thedabblergirl.com/uploads/1/3/1/0/131070230/gafago.pdf
    • http://bonnievig.com/uploads/1/3/1/4/131406115/6568432.pdf
    • http://sunrisecreationsbydawn.com/uploads/1/3/0/6/130639312/vegifep.pdf
    • http://smaraclari.com/uploads/1/3/0/4/130483136/lorodes.pdf
    • http://relst-uhag66.com/uploads/1/3/0/5/130588998/eb8b0d5829796d.pdf
    • http://squamishdoctors.com/uploads/1/3/0/8/130814515/c226ac.pdf
    • http://buyinstagrammention.com/uploads/1/3/0/6/130620282/6238416.pdf
    • http://tripletmamas.com/uploads/1/3/0/6/130639924/fewelijegu.pdf
    • http://greetersinternational.com/uploads/1/3/1/3/131380128/1817be7a8913610.pdf
    • http://yoraura.com/uploads/1/3/0/4/130435966/b1faa53b00e.pdf
    • http://unlazoenmovimiento.com/uploads/1/3/1/0/131070692/1e1d619dd7.pdf
    • http://pamelacowan.com/uploads/1/3/1/3/131381761/3637484.pdf
    • http://morefm917.com/uploads/1/3/1/4/131438379/2e44f.pdf
    • http://singlesnudistgroup.com/uploads/1/3/0/8/130874046/tofotur.pdf
    • http://joy-farm.com/uploads/1/3/0/6/130603828/7575683.pdf
    • http://plancollegedale.com/uploads/1/3/0/7/130739654/tekiwesonolifemuxewa.pdf
    • http://safeandtrained.org/uploads/1/3/0/7/130775119/zipixoje.pdf
    • http://eliyahu.us/uploads/1/3/0/6/130604314/terawi.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_off00007159.bin
bf7e0808ce24d2f40edf3886b654b08e2ad2e09a70aa865510b9801aa85c25fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7159 8456 bytes

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