Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e8f7972805d0f9…

MALICIOUS

PDF

38.4 KB Created: 2020-03-29 10:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11a874c2cb9b231fb7986f78a5d896b4 SHA-1: da70f985df28135c1c41e4835cc9382c85782a4b SHA-256: b1e8f7972805d0f945c1653c2f27f9e0b7d2a0d4fc44e159eee7e942915b1fdd
94 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. The document body, though partially corrupted, contains text related to project delimitation and references the wkhtmltopdf tool, suggesting it might be a generated document. The primary attack pattern appears to be SEO manipulation or a link farm designed to redirect users to potentially malicious content hosted on numerous domains. 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://theleawoodfamilydentist.com/uploads/1/3/0/6/130604770/130604770.html#delimitaci%C3%B3n+espacial+de+un+proyecto
    • http://allieplatt.com/uploads/1/3/0/5/130551805/mugiforafimobisax.pdf
    • http://mta-sts.adlinkdesign.com/uploads/1/3/0/2/130271073/romum_sosogenitaxizan_simitifo_gugonobori.pdf
    • http://mykirklandselitedesigns.com/uploads/1/3/0/3/130323422/35eb63.pdf
    • http://hostmaster.consumerschoicepos.com/uploads/1/3/0/6/130621485/b1235d428a7.pdf
    • http://altruisticamente.org/uploads/1/3/0/4/130483447/dutasuriwu.pdf
    • http://opergal.org/uploads/1/3/0/4/130490151/1f0ad16619c4a.pdf
    • http://www.evacamarenadesign.com/uploads/1/3/0/4/130478205/fibutafijezosuripag.pdf
    • http://mansakonko.nl/uploads/1/3/0/6/130621043/polafomexaxivi.pdf
    • http://texasstocklawyers.com/uploads/1/3/0/6/130620921/b4e44b011afff2.pdf
    • http://marijuanacultivationconsultants.com/uploads/1/3/0/2/130289227/7841767.pdf
    • http://rookone.co.uk/uploads/1/3/0/5/130551935/letobibemagugalor.pdf
    • http://kmdschool.org/uploads/1/3/0/8/130874309/5560749.pdf
    • http://admin.redmedreporting.com/uploads/1/3/0/7/130775341/2a3cb.pdf
    • http://tajts.net/uploads/1/3/0/8/130815437/tatek.pdf
    • http://hostmaster.johnjamesantiques.co.uk/uploads/1/3/0/7/130776889/fusirefezun.pdf
    • http://coderednurse.com/uploads/1/3/0/9/130969570/bofezasa.pdf
    • http://biblebaptistpreschool.com/uploads/1/3/0/6/130621432/4974489.pdf
    • http://briarcreekkennels.com/uploads/1/3/0/7/130775542/6894558.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_off00006cdc.bin
07784e87600bc25f0116842d27a86653697c5df56e68d9e7189cb8e6bd063672
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 7996 bytes