Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d15cfadc391440…

MALICIOUS

PDF

41.4 KB Created: 2020-04-18 11:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 66ee220bf60878009d69132392799887 SHA-1: 0100264622f3c63ca49f3d0b13e765b309836248 SHA-256: 16d15cfadc39144077003a02cc04e4c53bd5736e970c228bebb97b086036f999
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thebaristoriancafe.com/uploads/1/3/0/5/130543472/130543472.html#lala+ramswaroop+calendar+2019+pdf
    • http://tarahnew.com/uploads/1/3/0/4/130483178/091bd3b711095.pdf
    • http://lsusrea.com/uploads/1/3/0/4/130483163/3185157.pdf
    • http://alaskahistoryday.com/uploads/1/3/0/2/130288830/ditixomapi-pemadoriso-voxaxokotogumag.pdf
    • http://fromatobelieve.com/uploads/1/3/0/6/130622059/wawaboge.pdf
    • http://durgajewellers.net/uploads/1/3/0/3/130313021/ligisum_xebakanixane_pifolige_nomufi.pdf
    • http://koonyagarlicfestival.com/uploads/1/3/1/3/131384654/8025920.pdf
    • http://hhminiatures.com/uploads/1/3/0/8/130813784/eb0b9334.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648c.bin
00ab3926447833de7f347aad0a7f8c61d128f7db470c81c90c25d67afdcb9cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 7932 bytes
font_01_sfnt_off00008361.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 16036 bytes

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