Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b84a2b11c44431…

MALICIOUS

PDF

43.0 KB Created: 2020-06-23 03:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7452e36e9a9f365d6893d7d7cfa27973 SHA-1: 9eda49d0fd3d05e3b7f9416c33f82abb42b995dc SHA-256: 86b84a2b11c44431ad5a35e31341be60fc50c2a0c11bb4d96e51844194261907
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection to malicious content. The document body, though partially corrupted, includes references to 'Fresno city college tutorial center', likely a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://missionboostconsulting.com/uploads/1/3/1/6/131636960/131636960.html#fresno+city+college+tutorial+center
    • http://mta-sts.mx.empathyweek.com/uploads/1/3/0/5/130590339/9f23c4e335.pdf
    • http://moonflowerproduction.com/uploads/1/3/2/6/132682022/1b1569.pdf
    • http://vreasatifacafelul.com/uploads/1/3/0/2/130288448/vilodifu-nakulewuseba-mabugevitex-votipibajul.pdf
    • http://joewasp.org/uploads/1/3/0/6/130620479/0ae4603826b17.pdf
    • http://mail.cdhc.org/uploads/1/3/0/6/130621530/xijemamol_zitakus.pdf
    • http://moneybackrentals.com/uploads/1/3/0/7/130776341/2848957.pdf
    • http://mail.speluqueros.com/uploads/1/3/0/5/130550910/87509f0f841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cccconfer.zoom.us/j/598032434
    • 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://scripts.sil.org/OFL
    • 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_off000056ca.bin
150452b7312ff4e52e495d7fca94271074f3d1a866dff763371ee1871eda7c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CA 4908 bytes
font_01_sfnt_off0000678e.bin
45a6a76e351714572e9fb358875a8661aafbc02f71804b7ccaa1114f38c17e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 10268 bytes
font_02_sfnt_off00008ace.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACE 16060 bytes

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