Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b547fe6ea1542…

MALICIOUS

PDF

38.4 KB Created: 2020-03-11 10:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea2b650487f3ad52053304966e0fe197 SHA-1: 9ed123a0d1ba0fc809a641d6bb938561fc4684d5 SHA-256: e64b547fe6ea154202f500a2955424cd392a5bb2a371eb930de2759978cd6d22
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs. No scripts were extracted, limiting the analysis of direct payload execution.

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://unique-security-solutions.com/uploads/1/3/0/5/130551338/130551338.html#how+to+save+multiple+pages+as+one+pdf+on+mac
    • http://amityschuyler.com/uploads/1/3/0/6/130604286/3517162.pdf
    • http://www.getitnowhotdeals.com/uploads/1/3/0/3/130323588/c353ba938f.pdf
    • http://hostmaster.oakwoodplace.org.uk/uploads/1/3/0/2/130287873/3e9124cf2.pdf
    • http://www.embracelifetoday.net/uploads/1/3/0/5/130551091/b442531.pdf
    • http://www.europestylemonali.com/uploads/1/3/1/0/131070597/4742576.pdf
    • http://mx.chicopsychologist.com/uploads/1/3/0/7/130739618/puketikurexo.pdf
    • http://precabrummel.it/uploads/1/3/0/7/130775567/8196f2189a9.pdf
    • http://www.secure.bearcatmusic.org/uploads/1/3/0/6/130621847/5094740.pdf
    • http://wallinba.com/uploads/1/3/0/5/130547659/855984.pdf
    • http://www.tiedtogether2019.com/uploads/1/3/0/6/130639642/2095769.pdf
    • http://mobilizeonline.com/uploads/1/3/0/2/130270989/7263238.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_off00006d8a.bin
c2662421bfc0554cf35d75b6929d8ee7d37992ada48178beee2f8771cde91bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 7980 bytes

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