Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3eb27a2affafb8…

MALICIOUS

PDF

38.6 KB Created: 2020-06-07 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e060727e28c1cfc439b6b26f3e20c8f0 SHA-1: 0fb586e4de0db5bce3be9c392a6b47eb40252094 SHA-256: fd3eb27a2affafb8c9c18db44f1acafeed420798246f07981604c89c76bc4c88
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The embedded URLs point to various domains, many of which are likely part of this scheme. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and some of the URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://remodelacion.org/uploads/1/3/1/4/131453684/131453684.html#c%25C3%25A1ch+ph%25E1%25BB%25A5c+h%25E1%25BB%2593i+uy+t%25C3%25ADn+d%25C6%25B0%25E1%25BB%259Bi+60
    • http://mail.lyndafreeman.com/uploads/1/3/0/6/130621298/wuposudewunovid_jisifumemeviler_jasopaxigexo_sasab.pdf
    • http://drivebyshooting.net/uploads/1/3/0/8/130813115/2fb23cd3541ea.pdf
    • http://webmaster.meinhenna.de/uploads/1/3/0/8/130814058/1746247.pdf
    • http://gigoloasuloe.shop/uploads/1/3/0/7/130739284/150271a0.pdf
    • http://family1stpropertiesllc.org/uploads/1/3/0/7/130775510/sumobewugomujanazo.pdf
    • http://forsbergstudios.com/uploads/1/3/0/7/130775318/8872069.pdf
    • https://bifatapir.files.wordpress.com/2020/06/mamejalotopidogurepewe.pdf
    • https://vibuwili.files.wordpress.com/2020/06/42127774927.pdf
    • https://lipurenipagu.files.wordpress.com/2020/06/15845681355.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_off00005d35.bin
b9d1f5c5d338d8cd30511a65e772ca4ee7dff71e45a1d42bbfd35f921d692de7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 22040 bytes

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