Malicious PDF — malware analysis report

Static analysis result for SHA-256 86df1a1201162a58…

MALICIOUS

PDF

35.2 KB Created: 2020-04-03 12:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7bfba6b858a95cae44c50c05df9ba812 SHA-1: 9f70d889d0d2b68ffda620fbc9a6c4868f465b42 SHA-256: 86df1a1201162a58941bb115076663769fb4038c335bdc177c0dc822354f98c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The document body itself is largely obfuscated but contains references to the URLs, suggesting a lure to external resources.

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://jmhollandrentals.com/uploads/1/3/0/7/130739962/130739962.html#desigualdad+con+valor+absoluto+propiedades
    • http://sanarte.info/uploads/1/3/0/6/130639498/1f4218069.pdf
    • http://isabellemarcusauthor.com/uploads/1/3/0/4/130488851/8742078.pdf
    • http://startmarketingusa.com/uploads/1/3/0/2/130288348/8466137.pdf
    • http://perfectscoremedia.com/uploads/1/3/0/2/130272353/94b0cdd5.pdf
    • http://smartchemistrytutoring.com/uploads/1/3/0/6/130639849/019d79759f66b.pdf
    • http://ar-ball.com/uploads/1/3/0/3/130323738/podozesenoba.pdf
    • http://mellagold.com/uploads/1/3/0/3/130324167/lokejixed-dekivulimot-raxixig-muxapiluziv.pdf
    • http://sstaffordphotography.com/uploads/1/3/0/6/130620528/a8b5f.pdf
    • http://yogikasweden.se/uploads/1/3/0/2/130270775/4248121.pdf
    • http://petcarefxbg.com/uploads/1/3/0/9/130969405/busefivilimala-xamovov-jegowatefi.pdf
    • http://snohomishchristmastrees.com/uploads/1/3/0/9/130969511/4c3083c.pdf
    • http://cultivating-talent.com/uploads/1/3/0/6/130639852/4a7a5080cc0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a3.bin
a27c1725e9200799b1d8e11735efc122cfd4423380cead1991219822b12c9e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A3 7792 bytes
font_01_sfnt_off000075b6.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 2788 bytes

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