Malicious PDF — malware analysis report

Static analysis result for SHA-256 85463a7c857da5d7…

MALICIOUS

PDF

42.7 KB Created: 2020-03-30 12:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 1061fa1ba66367e7329528ad81889e83 SHA-1: 38cc6f643c70fc919ab11274f7422c853a75c1b5 SHA-256: 85463a7c857da5d74a74f612e540acc9481972953c59cc1d8a9c3b3e4bb3d987
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external websites, indicating a likely SEO link farm or a distribution point for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links supports the attack pattern of luring users to potentially harmful sites. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

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://bsa-sccc-pack301.com/uploads/1/3/0/4/130476981/130476981.html#ecuaciones+de+lanzamiento+vertical+y+caida+libre PDF link annotation
    • http://vancouvervideopro.com/uploads/1/3/0/8/130874554/2b45181ed34.pdfIn PDF document text
    • http://grace215.org/uploads/1/3/0/2/130272474/7005671.pdfIn PDF document text
    • http://green-elephant-trading.com/uploads/1/3/1/3/131384175/figij_navutefo_supigez.pdfIn PDF document text
    • http://almiraosmanovicthunstrom.com/uploads/1/3/0/7/130775503/kezev.pdfIn PDF document text
    • http://fcaky.com/uploads/1/3/1/3/131398479/fubededif.pdfIn PDF document text
    • http://whistletags.com/uploads/1/3/0/9/130969358/1210142.pdfIn PDF document text
    • http://legitedit.com/uploads/1/3/0/5/130588230/mudibi.pdfIn PDF document text
    • http://trademaxinc.com/uploads/1/3/0/6/130621719/8713373.pdfIn PDF document text
    • http://pdinternational.net/uploads/1/3/0/7/130739508/9301515.pdfIn PDF document text
    • http://partyriesling.com/uploads/1/3/0/6/130604799/95d2e0917b1cb32.pdfIn PDF document text
    • http://glenlakefinancing.com/uploads/1/3/0/4/130477131/7068951.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 8436 bytes
SHA-256: 9883193b103a27380277a717db62f9d0cf2a9118b0f9f754fe4b5aa536eb9b27
font_01_sfnt_off00008666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 16096 bytes
SHA-256: 65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac