Malicious PDF — malware analysis report

Static analysis result for SHA-256 b666f32475eb3dc3…

MALICIOUS

PDF

34.0 KB Created: 2020-05-24 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 4f14c09c357a6620b7d58e1b7ef7e6db SHA-1: dcebadfd3ebc2b78ece2019f0da0ce0cdaf0538b SHA-256: b666f32475eb3dc3d815a01a67c257a7fd0f03e9fc37569bb85bb61109195b20
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body contains metadata about its creation, but no direct user-facing text that would indicate a specific lure. The primary attack pattern observed is the distribution of numerous external links, likely to drive traffic or distribute further malicious content.

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://charlesglam.com/uploads/1/3/1/3/131378814/131378814.html#costos+2+cristobal+del+rio PDF link annotation
    • http://villacortavacations.com/uploads/1/3/0/2/130271061/159072.pdfIn PDF document text
    • http://reallyagoodgirl.site/uploads/1/3/0/5/130550697/259a6f0f1.pdfIn PDF document text
    • http://diazjonathan.com/uploads/1/3/1/0/131070754/dexuva_fokosedidoxo.pdfIn PDF document text
    • http://fearlesstennis.net/uploads/1/3/1/4/131409275/62f19ccd1.pdfIn PDF document text
    • http://modernmaternal.com/uploads/1/3/1/4/131453465/6648b3e0fffea6a.pdfIn PDF document text
    • http://davenportsalehouse.cocoabeachalehouse.com/uploads/1/3/0/2/130273804/patutu.pdfIn PDF document text
    • http://cpcontacts.beautyandmore.ie/uploads/1/3/0/7/130775055/4982e9453.pdfIn PDF document text
    • http://3333whitehall.net/uploads/1/3/0/6/130622061/texixeg.pdfIn PDF document text
    • http://beckywilliamstherapy.com/uploads/1/3/0/7/130776356/powapitoz.pdfIn PDF document text
    • http://yourwiguide.com/uploads/1/3/0/6/130621450/bf465.pdfIn PDF document text
    • http://horticycle.com/uploads/1/3/0/3/130323196/bagovifub.pdfIn PDF document text
    • http://fieldsmanagement.com/uploads/1/3/1/3/131384016/2535045.pdfIn PDF document text
    • http://globewatcher.com/uploads/1/3/1/3/131398117/4060688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A7 11352 bytes
SHA-256: 088105f20f884abb21501c53ca4c750ef594d3e44beaeebeedbc86c9430e138c