Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d84259e49e4fe7…

MALICIOUS

PDF

42.1 KB Created: 2020-04-05 13:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 800295e79387e1e64ab8a84803bd3688 SHA-1: 6dd38f51f93f089f6dc1727cdf7fabcec6dc12e4 SHA-256: 60d84259e49e4fe7cc33656f377276371955a9b1629667dc0552839cd1e9dbd3
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, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the nature of the embedded links suggests an intent to drive traffic to potentially compromised or malicious web pages.

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://harllie.com/uploads/1/3/0/6/130604527/130604527.html#instructions+to+put+together+jenny+lind+crib
    • http://amazingcollegeessays.com/uploads/1/3/0/4/130476273/106e8c335f62da.pdf
    • http://idealsoapworks.com/uploads/1/3/0/6/130639082/jupudupum-didis.pdf
    • http://topazcapitalgroup.net/uploads/1/3/1/1/131164398/b8b98.pdf
    • http://sigkddm.com/uploads/1/3/0/6/130621603/339049.pdf
    • http://limos-san-diego.com/uploads/1/3/0/8/130814060/7101349.pdf
    • http://phenomenallivinghomesllc.com/uploads/1/3/0/7/130738511/mavuxapijojido.pdf
    • http://peraltakh.com/uploads/1/3/0/8/130874364/1617714.pdf
    • http://toterraproductions.com/uploads/1/3/0/6/130639511/5e652.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_off000079b5.bin
3febca20023bfa9a13df4ebd76fdac5650c7eaaaea225f1c494dffdd2650f1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 8908 bytes

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