Malicious PDF — malware analysis report

Static analysis result for SHA-256 b870f3e8c6ba0bd5…

MALICIOUS

PDF

93.8 KB Created: 2020-04-12 01:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f60c2a0fb1f28b1832d555eb9965d5e1 SHA-1: e45d721a2796d3ed6a8d58d74f6c16b697b398d0 SHA-256: b870f3e8c6ba0bd5d4721e93449587f308c4bcfbfe8071b4c992d3c66fd22a72
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve as lures to redirect users to potentially malicious websites or to distribute further malware. No scripts were extracted from this sample.

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://woodlandstuition.com/uploads/1/3/0/8/130873852/130873852.html#deserci%C3%B3n+escolar+inegi
    • http://marriagecelebranthilaryvaneldik.com/uploads/1/3/1/4/131405948/6954505.pdf
    • http://sharper-point.com/uploads/1/3/0/8/130874292/6589.pdf
    • http://newfilmmakersadventure.com/uploads/1/3/0/7/130739052/8604451.pdf
    • http://win27.org/uploads/1/3/0/5/130550887/norekanogo-rumakukux-jedusikafabokab.pdf
    • http://travishallhasitall.com/uploads/1/3/0/4/130488175/vasosilebulide-takirosibofo-kepopuruw-wapodazeronenif.pdf
    • http://reikiangelandmassage.com/uploads/1/3/0/3/130379295/xamifufo.pdf
    • http://szkolenia-termowizja.pl/uploads/1/3/0/2/130289363/65db2a1485.pdf
    • http://elementalembodiment.com/uploads/1/3/0/5/130589125/zusovekibiben.pdf
    • http://prostatecurefoundation.com/uploads/1/3/0/5/130551754/futejedenazewum-rukavome-begofug.pdf
    • http://jonathandavidsmith.com/uploads/1/3/0/6/130604910/4e546865eb.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_off000143b1.bin
5488188fd5144525570c0b420ba095529fea448987e5af5d6d9084eb0764a25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 10744 bytes

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