Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e52c86c9cf3f52f…

MALICIOUS

PDF

32.0 KB Created: 2020-04-10 22:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc5982a1f67e83e1b395f4602052dfb4 SHA-1: ae47258c99a6af9bbeb7384a63703afe3e6b2924 SHA-256: 6e52c86c9cf3f52f60029bbdfaba5c572a4ba1bd3fb0de4c4c396fc572ab8c7b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. No scripts were extracted, but the structure suggests a potential for JavaScript execution or a lure for malicious downloads.

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://kalajarvenlomakyla.fi/uploads/1/3/0/3/130312925/130312925.html#father+abraham+chords
    • http://chalalabeauty.com/uploads/1/3/0/6/130639936/7841542.pdf
    • http://lflbdemocrats.com/uploads/1/3/0/9/130969184/mizuluwixepilonudo.pdf
    • http://jewelrylrobin.com/uploads/1/3/1/4/131407214/526b7f.pdf
    • http://apodera.org/uploads/1/3/0/2/130287266/xijefadew.pdf
    • http://annequigghealing.com/uploads/1/3/0/8/130874314/4094332.pdf
    • http://happyshare.shop/uploads/1/3/0/7/130775080/f9aa98e05e7a.pdf
    • http://feelfinelife.com/uploads/1/3/1/4/131438556/3234468.pdf
    • http://jaderosealchemy.com/uploads/1/3/0/7/130740141/dekipobudoxu.pdf
    • http://wallwalkers2015.com/uploads/1/3/0/6/130621083/6b7b9a708c0.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_off000054dc.bin
4267446f2be7b799538046c808523876eb86f5edea3d27ef0c82509c22ea0b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54DC 8448 bytes

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