Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b6b1a42d4b1cd1…

MALICIOUS

PDF

31.4 KB Created: 2020-05-16 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05aa60a691d518db2f39644580dd6013 SHA-1: ab632d6bb0fa6f3ac631d06d8a708a8f913c09be SHA-256: 10b6b1a42d4b1cd189247527433097d0c7eb76d1d35b9d90c78fb6cf20a885da
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mkmconcessions.com/uploads/1/3/0/7/130738554/130738554.html#length+measurement+conversion+worksheets
    • http://iwalkedtojerusalem.com/uploads/1/3/0/5/130551554/ratafolanudasowil.pdf
    • http://bobwolfe.net/uploads/1/3/0/3/130323585/xilafaveruber-galana.pdf
    • http://raldas.com/uploads/1/3/0/2/130287939/zomiz-lenejolefumiwa-lunosujo.pdf
    • http://exquisitelyexposeddesigns.com/uploads/1/3/0/2/130287426/suxawog.pdf
    • http://yachtinsurance.wales/uploads/1/3/1/4/131483128/vinekulo-kunodemuvasofam.pdf
    • http://seattlescores.org/uploads/1/3/1/1/131163917/venil_vezavuwuki.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000516b.bin
0fa4619e79bd859d03fe56d79b80441a9d2e98f2699829ef337747f4e846902c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x516B 9872 bytes

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