Malicious PDF — malware analysis report

Static analysis result for SHA-256 7623fd6b38388ca6…

MALICIOUS

PDF

39.6 KB Created: 2020-04-05 09:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 569fd548d38a610a08b91d9c4434d0a0 SHA-1: c7ca274e3a6cbf7aff86c7f6c6b499a0ec11c572 SHA-256: 7623fd6b38388ca69a0a6216135520d15b570f05e9d75ee50ad864a291f9002d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links to various PDF files hosted on numerous domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve the ranking of malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting this assessment. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user.

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://carpetcleancary.com/uploads/1/3/0/6/130639071/130639071.html#elementos+secundarios+de+un+triangulo+rectangulo
    • http://youngwordsmiths.club/uploads/1/3/0/5/130551311/romexaneg.pdf
    • http://teamketo.ca/uploads/1/3/0/9/130969283/6e398f6402c.pdf
    • http://welovechocolate.be/uploads/1/3/0/6/130604769/vosegajosuj_kudetuzozurimir.pdf
    • http://videoproductionkenosha.com/uploads/1/3/0/5/130540788/abc5b8047389.pdf
    • http://mbaexpertise.com/uploads/1/3/0/8/130813548/7715156.pdf
    • http://mykdwonline.net/uploads/1/3/0/9/130969369/d5df2179.pdf
    • http://gelinkalbigelinlik.com/uploads/1/3/0/3/130313230/waxosazuzudukiga.pdf
    • http://paddlingtoparadise.com/uploads/1/3/0/5/130551639/2843177.pdf
    • http://domaineoharas.com/uploads/1/3/0/5/130542859/binasaruwa.pdf
    • http://ueueueue.org/uploads/1/3/0/5/130540882/e24a5aaf0ae4.pdf
    • http://afraidtosay.org/uploads/1/3/1/3/131379643/nilizoverawi_lizidinubakeb_godagagox.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_off00006fd2.bin
a4cf75b610966bcb2d96ab578b12c77cb06e9bf843a234b15f3a058f9eb85e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD2 8616 bytes

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