Malicious PDF — malware analysis report

Static analysis result for SHA-256 045bcc634c7d463e…

MALICIOUS

PDF

54.7 KB Created: 2020-04-09 08:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4875db7a21d771d0dbbe8a9e73ef92fd SHA-1: b038802426388b0ff0f1bde12cb98f188af1848d SHA-256: 045bcc634c7d463e5cf61d3e88196ffd5b73fb651384c700ad6115b7b20d9bfe
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to direct users to malicious content or for SEO manipulation. The document body contains garbled text mixed with a URL and metadata, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://adventureinstincts.com/uploads/1/3/0/8/130873736/130873736.html#come+si+calcola+il+volume+del+cubo+formula
    • http://iprocolorado.com/uploads/1/3/1/1/131164394/8308497.pdf
    • http://101taiwantour.com/uploads/1/3/0/8/130813592/3cf0110.pdf
    • http://miraclesforlife.net/uploads/1/3/1/4/131453449/c561344af799235.pdf
    • http://tibbstibbs.com/uploads/1/3/1/3/131384171/f37b051.pdf
    • http://graceandgritenumclaw.com/uploads/1/3/0/9/130969850/balexawedodedaw.pdf
    • http://lifeinchinatown.com/uploads/1/3/1/3/131380031/danuwajuketax.pdf
    • http://drbreeawillingham.com/uploads/1/3/1/4/131407281/jemani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008af5.bin
d6968c3056df86204bd52810814cc44e2a7a7dde0657b0733e4afc9a6c287fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 9700 bytes
font_01_sfnt_off0000ae44.bin
9f5082701ede3b34412025578f3613d16372f7e661c8785cd8d7b7f4cdd3c0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE44 2800 bytes
font_02_sfnt_off0000b825.bin
04ea25da2c70496e6fa9ff7c8b7f148d557dce34a839e1da1a3a09c7673f2869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16176 bytes

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