Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f17f9347ad345c…

MALICIOUS

PDF

39.7 KB Created: 2020-04-05 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7ee31eeafd017cdd33a557f6e946a088 SHA-1: 81231cf5ee76eef2ebb04463c613287ce578bb74 SHA-256: 88f17f9347ad345cba5914f5d729b22d300f08376d1dc3e6f653b1c989962a45
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links. The embedded URLs point to various PDF files hosted on unrelated domains, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to a network of external resources, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://block1949-asu.com/uploads/1/3/1/4/131455825/131455825.html#charisma+on+command+course+review
    • http://mywebpagemanager.com/uploads/1/3/1/4/131454503/vadopurizu.pdf
    • http://andreserpoosh.com/uploads/1/3/0/6/130620456/9862739.pdf
    • http://cpanel.dinothetourist.com/uploads/1/3/0/6/130605041/vukebowomifawilotiz.pdf
    • http://livinflorida.org/uploads/1/3/0/5/130545421/7719847.pdf
    • http://porter.library.mesquiteisd.org/uploads/1/3/0/5/130589360/vigavo.pdf
    • http://visionhope195.org/uploads/1/3/1/4/131437012/biribezewigu.pdf
    • http://americasmerchantservices.com/uploads/1/3/1/3/131380146/6672737.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_off000071cf.bin
5dcbee4207eab5444589836c86f5c5e213dcd287ea20397ed71ad0affce510d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CF 7980 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.